Nottinghamshire town (6)
I believe the answer is:
newark
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nottinghamshire town</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)