Shout of disapproval from volume being reduced (3)
I believe the answer is:
boo
'shout of disapproval' is the definition.
(I've seen this before)
'volume being reduced' is the wordplay.
'volume' becomes 'book' (synonyms).
'being reduced' means to remove the last letter.
'book' with its final letter taken off is 'BOO'.
'from' is the link.
(Other definitions for boo that I've seen before include "get off!" , "Make one's dislike heard" , "Frightening word (for a goose?)" , "Shout of disapproval, maybe at ref" , "Sound made to show disapproval or contempt" .)