They're made to turn (6)

I believe the answer is:

hinges

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If this is the answer I cannot explain how the clue works.

(Other definitions for hinges that I've seen before include "Movable joints between lid and box, say" , "Depends on - like door?" , "A door swings on them" , "Doors swing on them" , "Flexible joints" .)

I've seen this clue in the Evening Standard.

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