Caught single copy (5)

I believe the answer is:

clone

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'copy' is the definition.
(I know that clone is a more specific form of the action copy)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for clone that I've seen before include "Plant or animal produced asexually from one parent" , "Person resembling someone else" , "Organism reproduced asexually from one ancestor, like Dolly the sheep" , "Not an original individual" , "Identical copy" .)

I've seen this clue in The Mirror.

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