Copper back indeed, somehow drawn out (6)
I believe the answer is:
educed
'drawn out' is the definition.
('educe' can be a synonym of 'draw out')
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for educed that I've seen before include "Drew out, elicited" , "Brought out or developed" , "Made to appear" , "Caused to develop, brought out" , "Brought out (something latent)" .)