Derisive whistle or shout (7)

I believe the answer is:

catcall

(Other definitions for catcall that I've seen before include "Feline shout of disapproval" , "Mocking shout or whistle" , "Derisive call" , "taunt from the audience" , "Audience's expression of disapproval" .)

I've seen this clue in The Times.

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