The capital of Norway (4)
I believe the answer is:
oslo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the capital of norway</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for oslo that I've seen before include "Capital in throes of go-slow" , "Nordic city" , "European capital city (found in Czechoslovakia!)" , "Northern city" , "Northern capital of Czechoslovakia?" .)