Related Clues:

• Muse tends to get moving, when absolutely unavoidable
• Apprentice hides nervous twitch
• Latter half of erotic spasm
• Nose scrunching, e.g
• ___ 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
• Involuntary, as a reaction