Hawk in range, worm agitated (9)
I believe the answer is:
warmonger
'hawk' is the definition.
(hawk can mean someone urging military action)
'range worm agitated' is the wordplay.
'agitated' is an anagram indicator.
'range'+'worm'='rangeworm'
'rangeworm' is an anagram of 'WARMONGER'.
'in' acts as a link.
(Other definitions for warmonger that I've seen before include "Bellicose person" , "Aggressor" , "Belligerent person" , "Jingoist" , "Hitler, perhaps" .)