Crossword Genius

Referees' instruments (8)

Ross

I believe the answer is:

whistles

(Other definitions for whistles that I've seen before include "Sounds of air forced through a small aperture" , "Shrill sounds made through pursed lips" , "Referees' tools" , "Sounds of air forced through small openings" , "Pipes with finger holes" .)

I've seen this clue in The Irish Times.
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