Crossword Genius

Referee (one hoping to ensure the game is up?) (7-6)

Ross

I believe the answer is:

whistle-blower

(Other definitions for whistle-blower that I've seen before include "Person with inside information making public some illicit activity" , "Informant on malpractice" , "One who exposes wrongdoing" , "One who informs on malpractice" , "Teller of tales to the authorities - referee?" .)

I've seen this clue in The Guardian.
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