Belligerent (5-8)
'belligerent' is the definition.
(synonyms)
This is all the clue.
(Other definitions for aggressive that I've seen before include "Rudely hostile" , "Vigorous" , "Forceful" , "Combative - pushing" , "Pushy" .)
'belligerent' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pugnacious that I've seen before include "Combative" , "Aggressive" , "Quarrelsome" .)
(Another definition for sabre-rattling that I've seen is " Aggressive display of military power".)
(Other definitions for surly that I've seen before include "Morose" , "Grumpily bad-tempered" , "Ill-natured" , "Bad-tempered, unfriendly" , "Ill-tempered, unfriendly" .)