He takes a gun out from a sliding compartment (6)

I believe the answer is:

drawer

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'sliding compartment' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for drawer that I've seen before include "Artist" , "Part of chest" , "Sliding box in chest" , "that's in a chest" , "Box in chest - one sketching?" .)

I've seen this clue in the Evening Standard.

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