Unknown priest going to heaven, incredibly (4)
I believe the answer is:
very
'incredibly' is the definition.
(I've seen this in another clue)
'unknown priest going to heaven' is the wordplay.
I cannot quite understand how this works, but
'unknown' could be 'y' (algebra) and 'y' is located in the answer.
The remaining letters 'ver' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for very that I've seen before include "jolly British!" , "light, perhaps" , "Frightfully" , "Kind of light" , "To a large extent" .)