Related Clues:

• Partner of Tac and toe
• Obsession
• Muscle twitch
• Habit, of a sort
• Odd mannerism
• Sudden movement
• Red hair, e.g.
• One-third of a child's game
• Tight curl
• Muscular contraction
• ''Hollywood Squares'' square
• 'A Nervous ___ Motion of the Head to the Left' (Andrew Bird song)
• Bit of stiffness
• Something bred for
• Quirky trait