Copper and gold brand (6)
I believe the answer is:
auburn
'copper' is the definition.
(I've seen this before)
'gold brand' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'brand' becomes 'burn' (brand can mean to burn a mark into something).
'au'+'burn'='AUBURN'
'and' is the link.
(Other definitions for auburn that I've seen before include "Reddish-brown, hair say" , "Goldsmith: 'Sweet . . . . . . loveliest village of the plain'" , "Shade of brown" , "Name of Goldsmith's deserted village (6)" , "Dark coppery red" .)