Crossword Genius

Czechoslovakian city? (4)

Ross

I believe the answer is:

oslo

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

'city?' is the definition.
(Oslo is an example)

'czechoslovakian' is the wordplay.
'OSLO' is hidden within the letters.
However, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for oslo that I've seen before include "where Ibsen lived under another name" , "European capital city (found in Czechoslovakia!)" , "Nordic capital" , "European capital in go-slow" , "European capital, known until 1924 as Christiania" .)

I've seen this clue in the Evening Standard.
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