Beat; sell (4)
I believe the answer is:
flog
I believe this clue is a double definition.
'beat' is the first definition.
(I know that flog is a more specific form of the action beat)
'sell' is the second definition.
(I know that sell can be written as flog)
(Other definitions for flog that I've seen before include "Beat with a whip or rod" , "Thrash" , "Lash" , "Scourge, whip" , "Exchange for money" .)