Smallest of the three countries among which Borneo is divided (6)

I believe the answer is:

brunei

(Other definitions for brunei that I've seen before include "Oil-rich sultanate of Borneo" , "E. Indies sultanate" , "major source of oil" , "Rue bin in the sultanate" , "Sultanate of southeast Asia" .)

I've seen this clue in The Times.

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