Look after bishop's territory as well, we hear (3,2)
I believe the answer is:
see to
'look after' is the definition.
(synonyms)
'bishop's territory as well we hear' is the wordplay.
'bishop's territory' becomes 'see' (I've seen this in another clue).
'as well' becomes 'too' (both can mean 'also').
'we hear' indicates a 'sounds like' (homophone) clue.
'too' is a homophone of 'to'.
'see'+'to'='SEE TO'
(Other definitions for see to that I've seen before include "Make sure" , "Look after" , "handle" , "Deal with" , "Sort out" .)