Chestnut's golden glow? (6)
I believe the answer is:
auburn
'chestnut's' is the definition.
(thesaurus)
'golden glow?' is the wordplay.
'golden' becomes 'au'.
'glow?' becomes 'burn' (synonyms).
'au'+'burn'='AUBURN'
(Other definitions for auburn that I've seen before include "Shade of hair" , "Reddish-brown, hair say" , "Goldsmith: 'Sweet . . . . . . loveliest village of the plain'" , "Reddish-brown hair colour" , "Red-brown hair colouring" .)