Related Clues:

• Maker of many calls
• Short official?
• Ring authority
• Whistle blower, for short
• Ring figure
• Ump's counterpart
• Court arbiter
• Officiate, briefly
• NBA hiree
• Ring or rink figure, briefly
• Grid coin tosser
• One whistling at athletes
• Person in a zebra-striped shirt, informally
• Fight stopper, at times
• Ump parallel