Inclined to introduce the head of religious education (8)
I believe the answer is:
learning
'education' is the definition.
(I know that learning is a type of education)
'inclined to introduce the head of religious' is the wordplay.
'inclined' becomes 'leaning' (similar in meaning).
'to introduce' is an insertion indicator (to introduce to can mean to insert or include).
'the head of religious' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'leaning' enclosing 'r' is 'LEARNING'.
(Other definitions for learning that I've seen before include "(Knowledge from) study" , "Aquiring skill or knowledge" , "Researching - scholarship" , "Instruction" , "Lore" .)