Related Clues:

• Hamper
• Ache
• Little jerk
• Peculiarity
• Involuntary muscular contraction
• Game opener?
• Muscle malady
• First X
• Uncontrolled contraction
• Hose problem
• Writer's woe
• Foible
• First of three in a pencil/paper game
• It could be represented by an "X"
• Persistent personal quirk