Superficially highbrow (4)
I believe the answer is:
arty
'superficially highbrow' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for arty that I've seen before include "Affectedly artistic" , "Having pretensions about paintings, music, etc" , "Bohemian" , "Affectedly interested in creative pursuits" , "Culturally creative" .)