Observe the bishop's territory (3)
I believe the answer is:
see
I believe this is a double definition.
'observe' is the first definition.
(observe can mean to see something)
'bishop's territory' is the second definition.
(I've seen this in another clue)
'the' acts as a link.
(Other definitions for see that I've seen before include "Observe the bishop's domain" , "Jurisdiction of a bishop" , "View; realise" , "Observe a bishopric" , "Perceive a bishopric" .)