Understand this is bishop’s responsibility (3)
I believe the answer is:
see
I believe this clue is a double definition.
'understand' is the first definition.
(I know that see is a more specific form of the action the understand)
'bishop's responsibility' is the second definition.
(jurisdiction of a bishop, eg the Holy See)
'this is' is the link.
(Other definitions for see that I've seen before include "Witness; ensure" , "judge" , "Bishop's area of control" , "Set eyes on" , "Perceive; meet (someone)" .)