Related Clues:

• 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
• Ump parallel
• Fight arbiter
• Paid whistle-blower, for short
• One involved in a faceoff
• Home body?
• Referee's assistant