Youth alive to climate crisis crossing northern country (9)

I believe the answer is:

greenland

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

'country' is the definition.
(I know that Greenland is a island nation)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for greenland that I've seen before include "Large N Atlantic island" , "Island with local name Kalaallit Nunaat" , "Island mostly north of the Arctic circle" , "Large island self-governing province of Denmark" , "5 island north of 13" .)

I've seen this clue in The Times.

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