Lofty music perhaps including organ playing (8)
I believe the answer is:
arrogant
'lofty' is the definition.
(thesaurus)
'music perhaps including organ playing' is the wordplay.
'music perhaps' becomes 'art' (music is a kind of art).
'including' is an insertion indicator.
'playing' indicates anagramming the letters.
'organ' with letters rearranged gives 'rogan'.
'art' enclosing 'rogan' is 'ARROGANT'.
(Other definitions for arrogant that I've seen before include "Overweening" , "Getting backs up" , "Overbearing with exaggerated sense of superiority" , "Overly self-important" , "Public speaker" .)