One who provides heaven-sent protection (8,5)
I believe the answer is:
guardian angel
'one who provides heaven-sent protection' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'one who provides heaven-sent protection' is the wordplay.
I cannot really understand how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found within the answer.
'protection' could be 'guard' (I've seen this before) and 'guard' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for guardian angel that I've seen before include "Person keeping an eye on one's safety (including a newspaper)" , "Protective spirit" , "Friendly spirit" , "Protecting spirit (in this paper?)" , "Protector (ours?) - city vigilante" .)