Bully for him! (6)
I believe the answer is:
hector
This clue is a double definition.
'bully' is the first definition.
(I've seen this before)
'him' is the second definition.
'for' acts as a link.
(Other definitions for hector that I've seen before include "Browbeat, bully" , "King's son" , "Bully (someone) verbally" , "Browbeat; Trojan hero" , "Bully - badger" .)