Sell loud record (4)
I believe the answer is:
flog
'sell' is the definition.
(I've seen this before)
'loud record' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'record' becomes 'log' (log is a kind of record).
'f'+'log'='FLOG'
(Other definitions for flog that I've seen before include "Keep hitting" , "Beat with whip or slangily sell" , "Lash" , "Thrash" , "Exchange for money" .)