Crossword Genius

Sibilant sound (4)

Ross

I believe the answer is:

hiss

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

This is all the clue.

(Other definitions for hiss that I've seen before include "Urgent whisper" , "Show disapproval" , "Make sibilant sound of disapproval as at villain" , "showing contempt?" , "(Make noise to) express disapproval" .)

I've seen this clue in The Guardian and The Times.
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