Only women in emirate? (4)

I believe the answer is:

oman

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'emirate?' is the definition.
(Middle Eastern state)

I can't explain the rest of the clue.

(Other definitions for oman that I've seen before include "Arab country" , "Arabian country, capital Muscat" , "Gulf sultanate" , "Sultanate on the south-east coast of the Arabian Peninsula" , "Middle Eastern country" .)

I've seen this clue in The Guardian.

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