Crossword Genius

Shrill sound (7)

Ross

I believe the answer is:

whistle

'shrill sound' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for whistle that I've seen before include "Simple fipple flute" , "Referee's instrument" , "What ref blows" , "Pucker up and blow" , "Blow through teeth" .)

I've seen this clue in The Independent.
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