Crossword Genius

Flag thrower, informally (3)

Ross

I believe the answer is:

ref

(Other definitions for ref that I've seen before include "Football's whistler" , "'Game judge, in short (3)'" , "In brief, a soccer controller" , "In brief, he controls a soccer match" , "Sports umpire" .)

I've seen this clue in The New York Times.
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