Asian country, capital Bandar Seri Begawan (6)

I believe the answer is:

brunei

(Other definitions for brunei that I've seen before include "Sultanate in northwest Borneo" , "Eastern land" , "Oil-rich sultanate of Borneo" , "Sultanate on the island of Borneo" , "Muslim state" .)

I've seen this clue in The Guardian.

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