Crown dependency close to nuclear area turning on cabinet (7)

I believe the answer is:

armoire

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'cabinet' is the definition.
(type of item of furniture)

I cannot understand how the remainder of the clue works.

(Other definitions for armoire that I've seen before include "item of furniture" , "Cabinet originally used for storing weapons" , "Large wardrobe or cabinet" , "Cupboard" , "Large wardrobe - more air (anag)" .)

I've seen this clue in The Times.

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