The Times Concise puzzle clues 2017 May 18

• Aid to walking Crossword Clue
• Amount added to a bill in a restaurant Crossword Clue
• Area set aside for flora and fauna Crossword Clue
• A risk for divers Crossword Clue
• Blood vessel Crossword Clue
• Drill a hole in Crossword Clue
• Feeling of well-being Crossword Clue
• Grass cutting tool Crossword Clue
• HMRC employee Crossword Clue
• Impend, portend Crossword Clue
• In a tailored style Crossword Clue
• Kenneth —, Carry On actor Crossword Clue
• Marlon —, film actor Crossword Clue
• Part of the brain Crossword Clue
• Physical or mental effort Crossword Clue
• Pleasure voyage Crossword Clue
• Scottish hillside Crossword Clue
• Soot; obscenities Crossword Clue
• Unctuous Crossword Clue