Crossword Genius

Boo's partner (4)

Ross

I believe the answer is:

hiss

'boo's partner' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for hiss that I've seen before include "Audio interference" , "Sharp sibilant sound" , "Sharp sound of disapproval" , "Urgent whisper" , "S-sound of disapproval" .)

I've seen this clue in the Ink Well xwords and the Universal.
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