Revolutionary form of Taoism (6)
I believe the answer is:
maoist
'revolutionary' is the definition.
(I have seen 'Chinese revolutionary ' mean 'maoist' so perhaps 'revolutionary' could also mean 'maoist')
'form of taoism' is the wordplay.
'form of' is an anagram indicator (the letters need to be in another 'form').
'taoism' is an anagram of 'MAOIST'.
(Other definitions for maoist that I've seen before include "Devotee once of the little red book" , "supporter of old Communist" , "Chinese-style left-winger" , "Supporter of a previous Chinese leader" , "Advocate of a Chinese form of communism" .)