See about following saint’s distinctive manner (5)
I believe the answer is:
style
'distinctive manner' is the definition.
(I've seen this before)
'see about following saint's' is the wordplay.
'see' becomes 'ely' (example where cathedral located in diocese).
'about' says the letters should be written backwards.
'following' means one lot of letters go next to another.
'saint' becomes 'st'.
'ely' back-to-front is 'yle'.
'yle' put after 'st' is 'STYLE'.
(Other definitions for style that I've seen before include "Distinctive manner" , "Manner or look" , "Method; elegance" , "Distinctive arrangement, elegance" , "Fashion - flair" .)