Religious dissent (6)
I believe the answer is:
heresy
'religious dissent' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for heresy that I've seen before include "Religious unorthodoxy" , "Iconoclasm" , "Unbelief" , "Unorthodox view" , "Doctrine that differs from the orthodox position" .)