Persian Gulf sultanate (4)

I believe the answer is:

oman

(Other definitions for oman that I've seen before include "Sultanate on the south-east coast of the Arabian Peninsula" , "Sultanate, capital Muscat" , "monarchy" , "Arab state" , "Land" .)

I've seen this clue in The Washington Post, the LA Times, the Newsday.com, the L.A. Times Daily and the Universal.

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