Nottinghamshire town (6)
I believe the answer is:
newark
'nottinghamshire town' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for newark that I've seen before include "Notts. town; NJ city" , "US port" , "Notts. town where King John died" , "US gateway" , "Market town on river Trent" .)