Produce a high-pitched sound by forcing air through the mouth (7)

I believe the answer is:

whistle

(Other definitions for whistle that I've seen before include "Hits Lew to make shrill sound" , "Make cheerful sound" , "Instrument; suit (slang)" , "sound surprised" , "He wilts (anag.)" .)

I've seen this clue in The Irish Times.

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