Whistle-blower on a field (7)

I believe the answer is:

referee

(Other definitions for referee that I've seen before include "Sports adjudicator" , "Umpire; arbitrator" , "One who decides" , "Arbiter" , "Sporting arbitrator" .)

I've seen this clue in the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.