A revolver, perhaps, usually has a handle (4)

I believe the answer is:

door

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'a revolver perhaps' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for door that I've seen before include "Usual entrance" , "Moveable structure at an entrance" , "Swinging barrier" , "Means of exit and entrance" , "Entrance to room, house etc" .)

I've seen this clue in the Evening Standard.

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