Related Clues:
- Ump's football counterpart
- Fight stopper, maybe
- Night-table appliance
- He calls the shots
- Signal, as for an 18 Across
- Dict., for one
- Sports "zebra"
- "Offside" official
- AM or FM device
- One may determine if a line has been crossed
- Maker of calls
- XM medium
- Beach bring-along
- Greet, call or salute
- Official who ensures fair play