The administrative centre of Norfolk (7)
I believe the answer is:
norwich
'the administrative centre of norfolk' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for norwich that I've seen before include "East Anglian city" , "E. Anglian county town" , "Largest city in East Anglia" , "English city" , "City on the River Wensum" .)