Related Clues:

• Half a breath mint?
• -- -tac-toe
• Game name start
• Gut feeling
• Feeling of remorse, say
• Sign of nerves, perhaps
• Little jerk?
• Hunger reminder
• Half a mint
• Moment of remorse
• Personal quirk
• Partner of Tac and toe
• Obsession
• Muscle twitch
• Habit, of a sort