The gold glow of chestnut (6)
I believe the answer is:
auburn
'chestnut' is the definition.
(thesaurus)
'the gold glow' is the wordplay.
'the gold' becomes 'Au' (Au is the chemical symbol for gold).
'glow' becomes 'burn' (synonyms).
'au'+'burn'='AUBURN'
'of' is the link.
(Other definitions for auburn that I've seen before include "Shade of hair" , "Name of Goldsmith's deserted village (6)" , "Golden" , "Copper" , "Dark coppery red" .)