Crossword Genius

Shout of disapproval (3)

Ross

I believe the answer is:

boo

'shout of disapproval' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for boo that I've seen before include "Startling utterance" , "Exclamation of disapproval" , "Cry of disapproval as at villain" , "Disapproving jeer" , "causing surprise!" .)

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