Crossword Genius

Cat's warning sound (4)

Ross

I believe the answer is:

hiss

(Other definitions for hiss that I've seen before include "(Make noise to) express disapproval" , "Snake's sibilant sound" , "Sharp sound of disapproval" , "Sibilant sound made through the teeth" , "Audio interference" .)

I've seen this clue in the LA Times.
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