He closes part of a camera (7)

I believe the answer is:

shutter

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'part of a camera' is the definition.
('shutter' is part of 'camera')

I can't explain the remainder of the clue.

(Other definitions for shutter that I've seen before include "camera component" , "It helps provide shade" , "Moveable window screen" , "application for Windows?" , "Camera mechanism" .)

I've seen this clue in The Mirror.

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