He edited article for dissident (9)
I believe the answer is:
heretical
'dissident' is the definition.
('heretical' can be a synonym of 'dissident')
'he edited article' is the wordplay.
'edited' is an anagram indicator.
'article' is an anagram of 'retical'.
'he'+'retical'='HERETICAL'
'for' acts as a link.
(Other definitions for heretical that I've seen before include "With unorthodox views" , "Religiously highly unorthodox" , "Unorthodox (in religion)" , "opposing the official line" , "Contrary to popular belief" .)