Aesthetically pretentious (4)
I believe the answer is:
arty
'aesthetically pretentious' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for arty that I've seen before include "Affectedly unconventional" , "aspiring to be creative?" , "Interested in painting, music, literature, etc" , "Dilettante" , "Boho" .)