They may be used for storing stretchers (5)

I believe the answer is:

racks

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'stretchers' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe you can see an association between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for racks that I've seen before include "Frameworks, for torture say" , "Frameworks for holding objects or for torture" , "Frameworks of shelving" .)

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

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