The administrative centre of Devon (6)
I believe the answer is:
exeter
'the administrative centre of devon' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for exeter that I've seen before include "Devonshire city" , "South-western English city" , "Administrative centre of Devon" , "The modern Isca Dumnoniorum" , "County town and cathedral city of Devon" .)