A A endlessly sozzled? (4)

I believe the answer is:

baku

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I'm afraid I can't even guess how this answer relates to the clue.

(Other definitions for baku that I've seen before include "Caspian Sea port" , "Azerbaijan's capital" , "Capital city of Azerbaijan" , "Capital of Azerbaijan on shore of Caspian Sea" .)

I've seen this clue in The Guardian.

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