East Anglian county (7)
I believe the answer is:
norfolk
'east anglian county' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for norfolk that I've seen before include "Agricultural county; type of jacket" , "English county containing the Broads" , "County of Norwich and Sandringham" , "Broad area" , "It has much farmland" .)