Artist accurately portraying subject is later trashed (7)
I believe the answer is:
realist
'artist accurately portraying subject' is the definition.
(realism portrays things realistically)
'is later trashed' is the wordplay.
'trashed' indicates anagramming the letters.
'is'+'later'='islater'
'islater' anagrammed gives 'REALIST'.
(Other definitions for realist that I've seen before include "One's practically inclined" , "Plato, for example" , "Pragmatic type" , "One with a pragmatic attitude" , "Is alert (anag)" .)