Haughty, imperious (8)
I believe the answer is:
arrogant
I believe this clue is a double definition.
'haughty' is the first definition.
(I've seen this in another clue)
'imperious' is the second definition.
(thesaurus)
(Other definitions for arrogant that I've seen before include "Disdainful" , "Haughty - imperious" , "Overbearing with exaggerated sense of superiority" , "Getting backs up" , "Overbearingly proud" .)