Badly rough up (4)
I believe the answer is:
maul
'badly rough up' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for maul that I've seen before include "Manhandle" , "Attack fiercely, tearing the flesh" , "beetle" , "Handle roughly, bruise" , "Injure badly by beating" .)