Copper and gold glow (6)
I believe the answer is:
auburn
'copper' is the definition.
(I've seen this before)
'gold glow' is the wordplay.
'gold' becomes 'au' ('Au' can be a synonym of 'gold').
'glow' becomes 'burn' ('burn' can be a synonym of 'glow').
'au'+'burn'='AUBURN'
'and' is the link.
(Other definitions for auburn that I've seen before include "Reddish-brown, hair say" , "Of hair colour, reddish brown (6)" , "Shade of brown" , "Golden" , "Goldsmith: 'Sweet . . . . . . loveliest village of the plain'" .)