Meet painter, horribly self-indulgent (11)
I believe the answer is:
intemperate
'self-indulgent' is the definition.
('intemperate' can be similar in meaning to 'self-indulgent')
'meet painter horribly' is the wordplay.
'horribly' indicates an anagram.
'meet'+'painter'='meetpainter'
'meetpainter' is an anagram of 'INTEMPERATE'.
(Other definitions for intemperate that I've seen before include "wild" , "Drinking alcohol to excess" , "Lacking self-control" , "consuming alcohol to excess" , "indulging to excess" .)