Related Clues:

• Expert on plays
• Boxing ring official (Abbr.)
• Flag thrower, at times
• Call the game, briefly
• Flag bearer
• Official in a striped shirt
• Worker among players
• O.E.D., e.g.
• Ruling official
• Ump's football counterpart
• Fight stopper, maybe
• He calls the shots
• Dict., for one
• Sports "zebra"
• "Offside" official