Pretentious one (4)
I believe the answer is:
snob
'pretentious one' 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 "Crispin" , "High-minded type" , "One despising inferiors" , "One has pretensions" , "Snooty type" .)