Capital of Czechoslovakia? (4)

I believe the answer is:

oslo

'capital' is the definition.
(capital of Norway)

'of czechoslovakia' is the wordplay.
'of' indicates a hidden word.
'OSLO' is hidden within 'czechoslovakia'.

(Other definitions for oslo that I've seen before include "Norwegian capital" , "Capital in throes of go-slow" , "Location" , "Scandinavian port" , "Northern capital of Czechoslovakia?" .)

I've seen this clue in The Mirror, the Evening Standard and The Daily Express.

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