Dark gold turned-up hat (8)
I believe the answer is:
sombrero
'hat' is the definition.
(sombrero is a kind of hat)
'dark gold turned-up' is the wordplay.
'dark' becomes 'sombre' (I've seen this before**).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'turned up' says the letters should be written backwards.
'or' back-to-front is 'ro'.
'sombre'+'ro'='SOMBRERO'
(Other definitions for sombrero that I've seen before include "Mexican's hat" , "Covering up" , "Broad-brimmed Mexican hat" , "a Mexican's overheads" , "CLOTHING" .)