Norwegian capital (4)

I believe the answer is:

oslo

(Other definitions for oslo that I've seen before include "Nordic city" , "Northern capital of Czechoslovakia?" , "Former Christiania" , "Norwegian city, formerly Kristiania" , "Scandinavian port" .)

I've seen this clue in the Sydney Morning Herald, the Newsday, the USA Today, the LA Times, The Star Tribune, the Canadiana, The Guardian, The Times, The Telegraph, The Mirror and the Universal.

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