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Steward or bailiff. Steward of a manor. Secure, nautically. Steward. Sandpiper Shore bird Star of "Superman II" Steward at a manor Superman Christopher "Superman" Christopher Superman, at the movies "Superman" actor "Superman" star "Somewhere in Time" star Superman portrayer Superman player "Still Me" autobiographer Christopher Superman portrayer Christopher "Somewhere in Time" actor Seymour's "Somewhere in Time" co-star 1978 Superman portrayer 'Superman' star Superman portrayer ___ school __ school ___ school ___ school (pre-college institution) ___ school (college type) ___ school (precollege institution) SAT ___ courses School homework Slice and dice, say Sous-chef's work Sous-chef's work Shut up Shut tightly Stamp of approval Signet Stamp of approval Shut tight Shut up Sea World performer Sea World clapper SeaWorld barker Swimmer with pups Symbolic medallion Sea World performer SeaWorld frolicker Sleek, whiskered swimmer Shut tightly Shut up SeaWorld performer Stamp of approval Shut tight Shut up Sea World performer Sea World clapper SeaWorld barker Swimmer with pups Secure, in a way See 62-Across ... and an acronym of the starts of 20-, 37- and 48-Across Sign of approval Seaquarium performer Stamp of approval Sea lion's relative SeaWorld entertainer Shut securely Shut tightly Sign of approval Singer married to Heidi Klum Solomon's ___. Symbol affixed to Presidential proclamations. Sigil. Sea animal. Signet ring. Signet. Secure. Sticker. Stamp. Sea lion. See 19 Down Sigil Secure Symbol of office See 35 Across Symbol on currency Sign of approval Stamp of authority Sea mammal Sea lion Signet Secure tightly Symbol of approval Sea World attraction Security item Shut (up) Shut up Stamp SeaWorld frolicker See 3-Down Security feature Signet ring feature Shut tightly Sea lion, e.g. Sea World performer Secure against leakage Sleek, whiskered swimmer Shut tightly Superman player Christopher Superman portrayer Christopher "Somewhere in Time" actor Screen Superman "Still Me" author "Superman" star Star of the "Rear Window" remake Superman who was a super man "Superman" star Christopher Superman player Superman portrayer Superman portrayer on film Superman portrayer Christopher "Superman" actor Christopher Superman star Superman star "Superman" actor Christopher ___ "Superman" portrayer Christopher "Superman" star "Still Me" autobiographer Christopher Screen Superman Superman actor Star of a "Rear Window" remake Superman portrayer Christopher Superman portrayer on film "Superman" actor Christopher Superman portrayer "Superman" star Christopher Superman Christopher Star of a "Rear Window" remake "Superman" star Superman, on screen 'Superman' star Superman Christopher Super man Christopher? 'Superman' star 'Superman' star Superman portrayer 'Superman' star Christopher Star of ''Superman'' Superman player Christopher Superman portrayer Christopher 'Superman' man 'Superman III' actor Superman portrayer Christopher Superman actor on night before Superman portrayer Christopher 'Superman' actor Christopher Super Kent player always around to conserve energy Superman actor "Superman" star 'Still Me' memoirist "Still Me" memoirist "Superman" star Superman player Superman player Superman actor "Superman" actor Christopher See 34-Down __ school Study for a test Scrub up Scrub up, say Scrub up, e.g. Slicing, dicing, etc. __ school SAT practice School type Sort of school, for short Study (for) ___ school Scrub up Scrub up, say Scrub up, e.g. Slicing, dicing, etc. SAT practice __ school Sous-chef's responsibility __ school Study (for)