Unorthodox head’s key refusal to accept point (8)
I believe the answer is:
antipope
'unorthodox head's' is the definition.
(religious leader opposing the official pope)
'key refusal to accept point' is the wordplay.
I cannot quite understand how this works, but
'key' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
an anagram of 'point' is 'ntipo' which is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for antipope that I've seen before include "Rival church leader" , "Schismatic pontiff based at Avignon" , "rogue cleric" , "Not so holy father" , "Rebel church leader" .)