Where, in Czechoslovakia, most people speak Norwegian (4)
I believe the answer is:
oslo
'where' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'czechoslovakia most people speak norwegian' is the wordplay.
'OSLO' is hidden in amongst the letters.
However, I'm unsure how the hidden word is indicated.
'in' is the link.
Can you help me to learn more?
(Other definitions for oslo that I've seen before include "Nordic city" , "Scandinavian city" , "Scandinavian port" , "foreign port" , "Northern capital of Czechoslovakia?" .)