The capital of Azerbaijan (4)

I believe the answer is:

baku

'the capital of azerbaijan' is the definition.
(synonyms)

This is all the clue.

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

I've seen this clue in The Guardian.

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