Related Clues:

• Nervous twitch
• Small spasm
• Nervous reaction
• One X of XXX
• Half a breath mint?
• Common contraction?
• -- -tac-toe
• Game name start
• Twitch or tic
• Sign of nerves, perhaps
• Little jerk?
• Change just a bit
• Slight adjustment
• Half a mint
• Muscular misfire