Monk left Church repelled in deception (7)
I believe the answer is:
recluse
'monk' is the definition.
(thesaurus)
'repelled in deception' is the wordplay.
'repelled' becomes 'ecl' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' is an insertion indicator.
'deception' becomes 'ruse' (I've seen this in another clue).
'ecl' inserted within 'ruse' is 'RECLUSE'.
'left church' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for recluse that I've seen before include "company leaver" , "One who avoids others" , "Hermit, loner" , "What, say, Howard Hughes became" , "One lives in solitude" .)