Related Clues:

• First correct ''Hollywood Squares'' square
• Start of a winning combination
• It can't be helped
• Nervous twitch
• Small spasm
• Nervous reaction
• One X of XXX
• Half a breath mint?
• -- -tac-toe
• Game name start
• Sign of nerves, perhaps
• Little jerk?
• Half a mint
• Personal quirk
• Obsession