Uppity person (4)
I believe the answer is:
snob
'uppity person' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snob that I've seen before include "One despising inferiors" , "One who considers himself socially superior" , "Socialite" , "Nose-in-the-air person who thinks he is socially superior" , "Stuck-up person" .)