Ceremonial county (7,6)
I believe the answer is:
greater london
'ceremonial county' is the definition.
(I know that Greater London is a ceremonial county)
This is the entire clue.
(Other definitions for greater london that I've seen before include "urban area" , "Capital area" , "within the M25 - with 21d" , "LSE's area?" , "conurbation" .)