Crossword Genius

"Boo" partner (4)

Ross

I believe the answer is:

hiss

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

I've seen this clue in The Washington Post.
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