Scandinavian city (4)
I believe the answer is:
oslo
'scandinavian city' is the definition.
(capital of Norway, a Scandinavian country)
This is the entire clue.
(Other definitions for oslo that I've seen before include "Capital in throes of go-slow" , "Capital often frozen" , "Solo in Norway?" , "Go solo to European capital" , "where Ibsen lived under another name" .)