Crossword Genius

Expression of disapproval (3)

Ross

I believe the answer is:

boo

'expression of disapproval' is the definition.
(as in a crowd booing)

This is the entire clue.

(Other definitions for boo that I've seen before include "Sound made to show disapproval or contempt" , "Surprising outburst" , "Poor reception" , "I disapprove" , "Expression of disapproval" .)

I've seen this clue in the Evening Standard.
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