Related Clues:

• Clockwork, by the sound of it
• Fan a this jerk in no moderate way
• 'That jerk will go with the clock, by the sound of it (3)'
• The sound of the clock for a jerk
• Behavioral oddity
• First correct "Hollywood Squares" square
• First correct "Hollywood Squares" spot
• First "O" of O-O-O
• Start of a pencil-and-paper game
• First of three X's or O's
• Tic- -- -toe board
• First X, say
• Undesirable movement practically contained
• Movement of authentication
• Spasmodic muscular twitch