Observe bishop's seat (3)
I believe the answer is:
see
This clue is a double definition.
'observe' is the first definition.
(I know that see is a type of observe)
'bishop's seat' is the second definition.
(I've seen this in another clue)
(Other definitions for see that I've seen before include "View; prelacy" , "Go out with; notice" , "Look at the bishop's domain" , "date" , "Observe the bishop's jurisdiction" .)