1952 Olympics host (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">1952 olympics host</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 oslo that I've seen before include "Solo in Norway?" , "Norway's capital city" , "Capital of Norway" , "City in Norway" , "Capital in throes of go-slow" .)