Related Clues:

• 'Steee-rike!' caller
• Call the shots
• Diamond caller
• Diamond arbiter
• Ref relative
• One whistling at athletes
• Diamond authority, briefly
• Person in a zebra-striped shirt, informally
• Diamond VIP
• Fight stopper, at times
• Ref
• One who gets the point
• Ump parallel
• Fight arbiter
• Paid whistle-blower, for short