Prayer provided illumination for some (6)
I believe the answer is:
litany
'prayer' is the definition.
(Litany is an example)
'provided illumination for some' is the wordplay.
'provided illumination' becomes 'lit' (I can't explain this - if you can you should give a lot more credence to this answer).
'for' means one lot of letters go next to another.
'some' becomes 'any' (similar in meaning).
'lit'+'any'='LITANY'
Can you help me to learn more?
(Other definitions for litany that I've seen before include "Long list (of requests or complaints)" , "Long and tedious list" , "Succession of requests" , "religious text" , "Lay tin down on the prayer" .)