Fruit that could be square (7)

I believe the answer is:

product

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'fruit' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for product that I've seen before include "Manufactured object" , "Drop cut (anag.)" , "Result of multiplication" , "Commodity offered for sale" , "Manufactured article for sale" .)

I've seen this clue in The Independent.

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