Crossword Genius

Noise of disapproval (3)

Ross

I believe the answer is:

boo

(Other definitions for boo that I've seen before include "Sound made to show disapproval or contempt" , "Make one's dislike heard" , "Cry of disapproval as at villain" , "Expression of disapproval" , "Disapproving jeer" .)

I've seen this clue in the Universal, The Times and The Sun.
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