Crossword Genius

WNBA arbiter (3)

Ross

I believe the answer is:

ref

(Other definitions for ref that I've seen before include "Whistleblower (abbr)" , "Football official (colloq.)" , "One traditionally in black" , "A diminutive umpire in soccer or boxing" , "Football's whistler" .)

I've seen this clue in the Universal.
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