Crossword Genius

Steam engine sound (4)

Ross

I believe the answer is:

hiss

(Other definitions for hiss that I've seen before include "less welcome sign?" , "Make sibilant sound of disapproval as at villain" , "Catcall" , "S-s-snake's s-s-sound?" , "S-sound of disapproval" .)

I've seen this clue in The New York Times.
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