He’s describing the storage compartment (6)

I believe the answer is:

drawer

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

I can't explain the rest of the clue.

(Other definitions for drawer that I've seen before include "One taking out money" , "Person writing cheque" , "Box-like container that slides" , "One providing cheque" , "One who writes cheque; storage box" .)

I've seen this clue in the Evening Standard.

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