One thing on a list 1/48 of a cup: Abbr One of those who has studied the form for flat races, presumably, in 9 across and 25 across, for the most part One selling to those pitching to 2 down and 24 across Order for duck and rice starter for guide One running for office, for short One who might have a contract with a sandal manufacturer Opposite of a freeway One in form maybe always allowed outside Oh, God Owing Overtime, abbr Obtain Opera solo Outer boundaries Obsolescent tape player, briefly Often-lengthy exam format One of 10 digits, often Opera highlight Opera whose name has the same vowels as 25-Down 'One Night in Miami' star Hodge Obsessed captain Ocean bird Opera solo Open space Opponent Off in the distance One of three in a carbon dioxide molecule Oodles Open to having multiple romantic partners Opposite of stiff Overhead trains Overly 2016 Olympics host “Okay, you win” Owed Once more Of small duration One-named singer with the 2014 #1 album '1000 Forms of Fear' Overabundance Old salt Old-time baseball slugger called "Master Melvin" On the way Online message One of a mule's parents Old salt Old-time baseball slugger called 'Master Melvin' On the way Obamacare acronym One-named supermodel Official language of Barbados (Abbr.) Opposite of remove Obamacare initialism Objectionable look Old Tokyo On the double Original tenant of 30 Rock Overly Oblivious Opposed Omen from newcomer involved in a row One doing the numbers for OAP from Singapore Organisation sounds like it's on drugs - it's a cause for anxiety Onetime Russian space station Online help page, for short Open ___ (plan to pay later) Of teeth One designs buildings Occasional bit of work Off drugs Old movie channel Once again? One has a day in May Of ocean motions On the summit of One's belt is loose, that's apparent Opportunities to employ court professionals Old photo tone Org. co-founded by Helen Keller Owned headnote, literally Ox-eye, perhaps following cow Old West challenge Orange coat Oklahoma tribe Origins One-time link One taken in by easiest trick, in my opinion Opens 4 across with shopkeeper - the one whose old energy business may be slack in part? 'Oh, and . . .' 'Obvi' On and on ... or how to read 18-, 27-, 37- and 51-Across to understand this puzzle's theme? Org. with strict schedules? Ottawa N.H.L.er, to fans One of the Tide's rivals Ones skilled at making deductions Orange edible Overly suave One may look for trends Organizer in a binder Offshore Oscar winner as Sophie and Margaret "___ & Oh's" (Elle King hit) One of the Tide's rivals Ones skilled at making deductions Orange edible Overly suave 6 on a phone One type of test for coronavirus Obscure Observe Overweight OB-GYNs and 49-Acrosses (Abbr.) Officiates a game Org. with a 'Football is gay' ad Oddly plump cases transforming insects Ogling the French sweetheart with girdle Old automaker with the models Firedome, Fireflite and Firesweep On the whole One-___ punch (kung fu technique) "OK, you're in trouble now!" Overperform Oliver Hardy's co-star Onetime RCA competitor Optima and Sorento Omelet choice Omelet choice 'Oh, brother, this guy stinks!' 'Oui' translation Opera set in Egypt Opie's dad Op-___ (newspaper columns) Opposite of tight Oslo's country ___ on the side of caution Office div One or more Old master knocks out Ted's wisdom tooth Official once content bypassing rare sinner Of the whole world Of the mail system One in time can save nine Offer as proof One may be forgiven Originally called Out of whimsy Org. with annual Humane Awards Ouzo kin Overly excite Official imposition Once-a-year flier One working under pressure 'Oh, no!' One using a lot of hot air One-liner "Oh, no!" One using a lot of hot air One-liner One may do laps ... or be found in a pool One may taste more sweet than sour One mixing things up at work Organs Brahma has eight of Ornamental plant hidden in 'look who's talking' '16 Olympics site Overweight Outhouse Olympic fencing event in which Italians won individual gold from 1932 to 1960 '___ often costs too much': Emerson Opulent 2020 Olympic event in which two British gold medallists both rode the same horse Olympics projectiles Obnoxious jerk, in British slang Oct. 31 exclamation Olympic team for Simone Biles and Suni Lee Opposite of clumsy Ordered, with 'around' Organize, as a playlist Organizes into a row Ortiz of 'Love, Victor' Out of control Overfastidious Oxygen producer Off-road vehicle Oktoberfest quaff Old AT&T rival Old cereal box stats Old dagger Old Tokyo One of eight Yankee World Series victories One-hit wonder [Hero 2] Org. concerned with flight risks Org. for netmen Original Dungeons & Dragons co Oscar winner Redmayne Opinions Origin of oranges Ornate tie Off-road vehicle Oktoberfest quaff Old AT&T rival Old cereal box stats Old dagger Old Tokyo One of eight Yankee World Series victories One-hit wonder [Hero 2] Org. for netmen Org. concerned with flight risks Original Dungeons & Dragons co Oscar winner Redmayne "Objects in mirror ___ ..." Offerings to the poor One of 2.43 billion in the U.S One pushup, for example Outdoor event breaker-upper Of utmost importance One may be loaded with cash One might hold your beer Otherwise One of 60 in a min Org. confiscating a water bottle, maybe Orlando Magic org ___ off (prevent) ___ out (saddens) Online info list Outback bird (Of sound) softened Old computer input format 'Once ___ a time' One apologies for a mistake in the paper by Cicero torn all over the place Open up to great primate One of the biblical twelve On the up-and-up On the ___ of the moment Once more One of ancient China's Three Kingdoms Over there Older partner? Older partner? __ of measure (gallon or mile) One of a married couple *Out too late Okras One of the Greats? Old oath that anagrams to "aged" One may cheat a polygraph test Opera solo Order a la ___ One of the primates Opponent Oversees Observe