Northern capital (9)
I believe the answer is:
reykjavik
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">northern capital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for reykjavik that I've seen before include "Iceland's capital" , "Icelandic capital" , "Capital of Iceland" , "The city" .)