Bishop's seat moved north-east (6)
I believe the answer is:
throne
'bishop's seat' is the definition.
(a bishop sits on a throne)
'moved north-east' is the wordplay.
'moved' is an anagram indicator.
'east' becomes 'e' (synonyms).
'north' with letters rearranged gives 'thron'.
'thron'+'e'='THRONE'
(Other definitions for throne that I've seen before include "Royal chair" , "toilet" , "Oh rent out this seat" , "Hornet (anag) -- lavatory" , "Seat of authority" .)