Nobel Peace Prize city (4)
I believe the answer is:
oslo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nobel peace prize city</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for oslo that I've seen before include "European capital, known until 1924 as Christiania" , "Former Christiania" , "Scandinavian port" , "Capital in throes of go-slow" , "European capital city (found in Czechoslovakia!)" .)