Revolutionary art and its characteristics (6)
I believe the answer is:
traits
'characteristics' is the definition.
(I've seen this before)
'revolutionary art and its' is the wordplay.
'revolutionary' is a reversal indicator (letters revolve around).
'and' is a charade indicator (letters next to each other).
'art' backwards is 'tra'.
'tra'+'its'='TRAITS'
(Other definitions for traits that I've seen before include "Identifying features or qualities" , "Identifying characteristics" , "Distinguishing features" , "Characteristics of artist" , "Characteristics, distinguishing qualities" .)