A sultanate (4)

I believe the answer is:

oman

'a sultanate' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Telegraph.

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