Bully boy (6)
I believe the answer is:
hector
This clue is a double definition.
'bully' is the first definition.
(I've seen this before)
'boy' is the second definition.
(I've seen this before)
(Other definitions for hector that I've seen before include "Greek fighter" , "Bully - badger" , "Nag" , "King's son" , "Browbeat, bully" .)