Related Clues:

• Polo official
• Rink official
• Penalty caller
• One whose chest is protected, briefly
• Court judge, briefly
• Figure behind the plate
• One works at home
• Diamond boss
• Plate cleaner, at times
• Official, informally
• He's sure to clean his plate
• Ballpark worker
• Gridiron zebra
• One is at home
• Ring arbiter