Mr Martin, the cathedral clergyman (4)
I believe the answer is:
dean
This might be a double definition.
'mr martin' is the first definition.
'dean' can be an answer for 'martin' (Dean Martin). I'm unsure of the 'mr' bit.
'cathedral clergyman' is the second definition.
'dean' can be an answer for 'clergyman' (dean is a kind of clergyman). I am not sure about the 'cathedral' bit.
'the' is the link.
Can you help me to learn more?
(Other definitions for dean that I've seen before include "University officer" , "James ..., film actor" , "Jonathan Swift's occupation" , "Church or college dignitary" , "Cathedral cleric" .)