Copper and tin alloy (6)
I believe the answer is:
bronze
'copper and tin alloy' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bronze that I've seen before include "Third prize" , "Hard alloy suitable for casting" , "Third place - alloy" , "Copper and tin alloy - sculpture" , "Tan; metal alloy" .)