Visit diocese (3)
I believe the answer is:
see
I believe this clue is a double definition.
'visit' is the first definition.
(seeing is a kind of visiting)
'diocese' is the second definition.
(I've seen this before)
(Other definitions for see that I've seen before include "twig" , "View; prelacy" , "ecclesiastical division" , "Set eyes on" , "Bishop's area of control" .)