Related Clues:

• XXX center
• Part of a "Hollywood Squares" winner
• Middle O of O-O-O
• Tie __
• Tic-__-toe
• Middle square, say
• See 6 Across
• Middle of three in a row?
• Middle of XXX or OOO
• Middle of a game
• Middle O, in a game
• One of three in a row
• Middle of three X's
• Game center
• Tic- -- -toe