He closes part of a camera (7)

I believe the answer is:
shutter
'part of a camera' is the definition.
('shutter' is part of 'camera')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for shutter that I've seen before include "camera component" , "It helps provide shade" , "Moveable window screen" , "application for Windows?" , "Camera mechanism" .)