Sell fine piece of wood (4)
I believe the answer is:
flog
'sell' is the definition.
(thesaurus)
'fine piece of wood' is the wordplay.
'fine' becomes 'f' (abbreviation).
'piece of wood' becomes 'log'.
'f'+'log'='FLOG'
(Other definitions for flog that I've seen before include "Keep hitting" , "Scourge, whip" , "Swing a cat, perhaps" , "Beat with whip or slangily sell" , "Hit - sell" .)