Related Clues:
- Sports 'zebra,' for short
- Official in a striped shirt, for short
- Call on the field
- Sure — football will involve one
- One maintaining order on the court, say
- One who might work in the wings of a theater
- Whistle blower on a court
- Call, as a soccer game
- Whistleblower retires in Tenerife region
- One issuing red cards, for short
- Zebra with a whistle
- Penalty flag tosser, for short
- NBA game "zebra"
- One to whom you might say 'Boo!'
- Sports replay reviewer