Sounds from angry fans (4)
I believe the answer is:
boos
'sounds from angry fans' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for boos that I've seen before include "Shouts of derision" , "Shows disapproval" , "Shouts of disapproval" , "Catcalls" , "Sounds of disapproval" .)