Suit drank bubbly in mountainous region (9)

I believe the answer is:

kurdistan

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

'mountainous region' is the definition.
The definition suggests a singular noun which matches the answer.

'suit drank bubbly' is the wordplay.
'suit drank' anagrams to 'KURDISTAN'.
Though, I am not clear how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Another definition for kurdistan that I've seen is " province".)

I've seen this clue in The Telegraph.

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