Related Clues:

• Game official
• 'Kill the ___!' (ball park cry)
• Whistle blower
• Court figure
• Referee
• One who makes calls
• Ballpark figure
• Diamond authority
• Ump
• Striped shirt wearer
• Whistler, at times
• Make the call
• One in a corner?
• There's one at home
• Flag thrower