Crossword Genius

What's spoken extensively: Romania, Bosnia (obviously), Czech Republic (officially accepted) – that's just for starters! (5-5)

Ross

I believe the answer is:

serbo-croat

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

'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.
Want a hint initially instead of a full solution? Install my app