Deeply impressed Vatican chief makes way for the bishop to get to the geological feature (6)
I believe the answer is:
graben
'deeply impressed vatican chief makes way for the bishop' is the definition.
I can't judge whether this definition defines the answer.
'get to the geological feature' is the wordplay.
'get' becomes 'be' ('get' can mean 'come to be').
'to the geological' becomes 'gran' (I can't explain this - if you can you should give a lot more credence to this answer).
'feature' indicates putting letters inside.
'be' placed inside 'gran' is 'GRABEN'.
'to' is the link.
Can you help me to learn more?
(Another definition for graben that I've seen is " valley".)