If you want to stock up with furniture, here's a piece (3)

I believe the answer is:

cot

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'piece' is the definition.
The answer and definition can be both man-made objects as well as being singular 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 cot that I've seen before include "Small child's bed" , "Function" , "Baby's bed" , "Infant's bed" , "Crib" .)

I've seen this clue in the Evening Standard.

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