Related Clues:

• ''___ Tac Dough'' (game show)
• Minor flaw
• First 'O'?
• Fixation
• Shortcoming
• X or O, in a game
• Uncontrollable movement
• Habitual jerk
• "Space ___" ("Ground control to Major Tom" song)
• First of three O's, perhaps
• Minor failing
• -- Tac (breath mint)
• Start of a grid game
• Strange thing
• Habitual spasm