See collies be terribly hostile (9)
I believe the answer is:
bellicose
'hostile' is the definition.
(thesaurus)
'see collies be terribly' is the wordplay.
'terribly' indicates anagramming the letters.
'collies'+'be'='colliesbe'
'colliesbe' with letters rearranged gives 'BELLICOSE'.
(Other definitions for bellicose that I've seen before include "Pugnacious, eager to fight" , "wanting fight" , "Warlike" , "Combative" , "Jingoistic" .)