Related Clues:

• Twitch or tic
• Sign of nerves, perhaps
• Little jerk?
• Half a mint
• Muscular misfire
• Burst of energy
• Personal quirk
• Partner of Tac and toe
• Hiccup cause
• Obsession
• Muscle twitch
• Crick in one's neck, e.g.
• Habit, of a sort
• Odd mannerism
• Sudden movement