Crossword Genius

Sound made by escaping air (4)

Ross

I believe the answer is:

hiss

(Other definitions for hiss that I've seen before include "Make sibilant sound of disapproval as at villain" , "(Make noise to) express disapproval" , "Sound of serpent" , "Wordless sound of disapproval" , "Make disapproving sound" .)

I've seen this clue in The Mirror.
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