Polish upset over extremists escaping authority in country (7)

I believe the answer is:

burundi

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

'country' is the definition.
(I know that Burundi is a country)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for burundi that I've seen before include "Country S. of Rwanda" , "part of Africa" , "Central African country, capital Bujumbura" , "Central African republic" , "African territory" .)

I've seen this clue in The Telegraph.

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