Related Clues:

• ___ Tac mints
• Nose twitch, e.g
• Idiosyncratic habit
• Movement perceived in previous answer?
• Involuntary habit
• Constant grimacing, e.g
• Poker game tell, perhaps
• Involuntary movement, brief shake?
• Constant knuckle-cracking, e.g
• Constant lip-chewing, e.g
• With 3 Down, Certs alternative
• Idiosyncratic quirk
• Start of a simple game name
• Sign of anxiety, perhaps
• Spasm geneticist conceals