Crossword Genius

TKO caller (3)

Ross

I believe the answer is:

ref

'tko caller' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the Penny Press and The Star Tribune.
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