Crossword Genius

Solo composition, Norwegian (4)

Ross

I believe the answer is:

oslo

I'm a little stuck... Click here to teach me more about this clue!

'norwegian' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'solo composition' is the wordplay.
'composition' is an anagram indicator.
'solo' with letters rearranged gives 'OSLO'.

Can you help me to learn more?

(Other definitions for oslo that I've seen before include "Norwegian capital" , "Former Christiania" , "European capital in go-slow" , "City in Norway" , "Northern city" .)

I've seen this clue in the Evening Standard.
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