The loud fellow scoffed (3)
I believe the answer is:
fed
'scoffed' is the definition.
'the loud fellow' is the wordplay.
'the loud' becomes 'f' (short for forte - 'loud' in music).
'fellow' becomes 'ed' (I've seen this in other clues).
'f'+'ed'='FED'
(Other definitions for fed that I've seen before include "Banking authority" , "Nourished" , "American cop" , "US agent" , "Dished up food" .)