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 Daily Express, The Mirror and the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.