Copy element (6)
I believe the answer is:
carbon
I believe this is a double definition.
'copy' is the first definition.
(carbon is a kind of copy)
'element' is the second definition.
(carbon is a kind of element)
(Other definitions for carbon that I've seen before include "Element of glass" , "Element in coal and diamonds" , "C (with a footprint)" , "Non-metallic element, C" , "Flimsy" .)