Expression of disapproval (9)
'expression of disapproval' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for reprimand that I've seen before include "Tick off - carpet" , "Admonish" , "Official scolding" , "Severe telling-off" , "telling off" .)
(Other definitions for objection that I've seen before include "Demur" , "Statement of protest" , "Argument against" .)
(Other definitions for criticism that I've seen before include "Unfavourable judgment" , "Evaluation or fault-finding" , "Examination and judgment of something" , "Condemnation" , "Disapproval; review" .)
'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 "Shout of dislike" , "Exclamation to startle" , "Sound expressing disapproval" , "Negative reaction" , "Cry that shocks" .)