Turk's short sentence that's overturned and finally annulled (7)

I believe the answer is:

ottoman

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'turk's' is the definition.
(the Ottoman Empire became Turkey)

I can't explain the remainder of the clue.

(Other definitions for ottoman that I've seen before include "Backless seat" , "Low upholstered seat - relating to a Turkish dynasty" , "Shared seat" , "Type of seat; Turkish" , "Am not to (anag)" .)

I've seen this clue in The Times.

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