Hawk, bellicose person (9)
I believe the answer is:
warmonger
This clue is a double definition.
'hawk' is the first definition.
(hawk can mean someone urging military action)
'bellicose person' is the second definition.
(I've seen this before)
(Other definitions for warmonger that I've seen before include "Jingoist" , "Bellicose person" , "Belligerent person" , "Hitler, perhaps" , "Hawk" .)