Gold stream looking reddish brown (6)
I believe the answer is:
auburn
'reddish brown' is the definition.
(I've seen this before)
'gold stream looking' is the wordplay.
I cannot quite see how this works, but
'gold' could be 'au' (Au is the chemical symbol for gold) and 'au' is found in the answer.
'stream' could be 'burn' (a burn is a small stream) and 'burn' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for auburn that I've seen before include "Red-brown hair colouring" , "Name of Goldsmith's deserted village (6)" , "Reddish-brown, hair say" , "Goldsmith: 'Sweet . . . . . . loveliest village of the plain'" , "Copper" .)