Beat in golf round (4)
I believe the answer is:
flog
'beat' is the definition.
(flogging is a kind of beating)
'golf round' is the wordplay.
'round' is a reversal indicator.
'golf' written backwards gives 'FLOG'.
'in' acts as a link.
(Other definitions for flog that I've seen before include "Thrash" , "-- Hitler" , "Beat with a whip or rod" , "Lash" , "Whip severely" .)