See following river bank (4)
I believe the answer is:
rely
'bank' is the definition.
(thesaurus)
'see following river' is the wordplay.
'see' becomes 'ely' (example where cathedral located in diocese).
'following' is a charade indicator (letters next to each other).
'river' becomes 'r'.
'ely' put after 'r' is 'RELY'.
(Other definitions for rely that I've seen before include "Depend confidently (on)" , "Old rally" , "Bank (on someone)" , "Be sure" , "Trust, depend" .)