Copied organism (5)
I believe the answer is:
clone
'copied organism' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for clone that I've seen before include "Plant or animal produced asexually from one parent" , "Organism reproduced asexually from one ancestor, like Dolly the sheep" , "Copied organism" , "Propagate asexually; copy" , "Replicate" .)