What's spoken extensively: Romania, Bosnia (obviously), Czech Republic (officially accepted) – that's just for starters! (5-5)
I believe the answer is:
serbo-croat
'what's spoken' is the definition.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for serbo-croat that I've seen before include "European" , "language" .)
I've seen this clue in The Everyman puzzle in The Observer.
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