Capital of Czechoslovakia (4)

I believe the answer is:

oslo

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

'of czechoslovakia' is the wordplay.
'of' says the answer is hidden in the clue.
'OSLO' can be found hidden inside '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 Daily Express and the Evening Standard.

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