Maoist is involved in Chinese philosophy (6)
I believe the answer is:
taoism
'chinese philosophy' is the definition.
(I've seen this in another clue)
'maoist is involved' is the wordplay.
'is involved' is an anagram indicator (involved can mean confusing or complex).
'maoist' anagrammed gives 'TAOISM'.
'in' acts as a link.
(Other definitions for taoism that I've seen before include "Religious movement" , "Chinese thinking" , "Maoist (anag) -- Chinese religion" , "Confused Maoist in Chinese religious system" , "philosophy in China" .)