From which to make the draw (7)

I believe the answer is:

holster

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'draw' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for holster that I've seen before include "Revolver' cover" , "Receptacle for a hand-gun" , "Lost her (anag.)" , "Holder for a hand-gun" , "Gun-case" .)

I've seen this clue in The Globe and Mail.

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