Related Clues:

• Some grid officials
• Wrestling officials, briefly
• Calls a game
• Cries foul?
• Calls the shots?
• Tennis officials
• Sports 'zebras'
• Some whistle-blowers
• Striped-shirt wearers
• Game officials
• Lacrosse arbiters
• Officials on the court
• Ring arbiters
• Football off'ls
• Playing field figures