Religious rebel showing a refusal to accept suggestion (8)
I believe the answer is:
antipope
'religious rebel' is the definition.
The definition suggests a singular noun which matches the answer.
'a refusal to accept suggestion' is the wordplay.
'refusal' becomes 'nope' (nope can informally mean no).
'to accept' means one lot of letters goes inside another.
'suggestion' becomes 'tip' (tip is a kind of suggestion).
'nope' placed around 'tip' is 'ntipope'.
'a'+'ntipope'='ANTIPOPE'
'showing' is the link.
Can you help me to learn more?
(Other definitions for antipope that I've seen before include "Rival for the Papal throne" , "Breakaway religious leader" , "Not so holy father" , "Opposition bishop" , "Rebel church leader" .)