Related Clues:

• Persistent personal quirk
• ___-tac-toe
• Tic- -- -toe
• First O?
• Tic toe --
• Middle X or O, perhaps
• Quirky behavior
• The first O of O-O-O
• One might be verbal
• Middle X or O
• Involuntary contraction
• First O of O-O-O
• Tic-toe link
• First correct Hollywood Square
• Tic follower