Bully, threaten (6)
I believe the answer is:
hector
This clue is a double definition.
'bully' is the first definition.
(synonyms)
'threaten' is the second definition.
(thesaurus)
(Other definitions for hector that I've seen before include "Intimidate by bullying, like Trojan prince killed by Achilles" , "Greek fighter" , "Trojan hero - bully" , "Annoy like a Trojan hero" , "King's son" .)