Quarrelsome, belligerent (10)
I believe the answer is:
aggressive
I believe this clue is a double definition.
'quarrelsome' is the first definition.
(thesaurus)
'belligerent' is the second definition.
(synonyms)
(Other definitions for aggressive that I've seen before include "Rudely hostile" , "Pushy" , "Forceful" , "Showing anger" , "Belligerent" .)