Called priest away to see One Foot in the Grave (4)
I believe the answer is:
aged
'foot in the grave' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?
'called priest away to see one' is the wordplay.
'called priest away' becomes 'ged' (I can't justify this - if you can you should believe this answer much more).
'to' means one lot of letters go next to another (I've seen this in other clues).
'see one' becomes 'a'.
'ged' after 'a' is 'AGED'.
Can you help me to learn more?
(Other definitions for aged that I've seen before include "Elderly" , "not a modern copy" , "Long in the tooth" , "Became older" , "Time-worn" .)