Genetic copies (6)
I believe the answer is:
clones
'genetic copies' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for clones that I've seen before include "Propagates as with Dolly the sheep" , "Genetically identical copies" , "Genetically identical organisms derived from a single cell" , "Identical copies of cells" , "Organisms reproduced asexually" .)