Just for fun, get a cleric to finish a novel (5)
I believe the answer is:
revel
'just for fun' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'get a cleric to finish a novel' is the wordplay.
'get' means one lot of letters go next to another.
'a cleric' becomes 'Rev' (abbreviation for Reverend).
'to finish a novel' becomes 'el' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rev' put next to 'el' is 'REVEL'.
Can you help me to learn more?
(Other definitions for revel that I've seen before include "Lever (anag.)" , "Paint the town red" , "Take great delight (in)" , "Make merry, have a ball" , "Have a few drinks etc." .)