Related Clues:

• Part of three-in-a-row
• 'Believe It Or Not!' item
• Nervous habit
• Rare bird
• Sudden spasm
• Certain X or O
• Half a mint?
• X-X-X part
• Freckles, for one
• ___ Tacs (breath mints)
• Facial twitch
• Muscle movement
• First ''O'' of O-O-O
• Genetic attribute
• Blue eyes or curly hair, say