Copper and zinc alloy (5)
I believe the answer is:
brass
'copper and zinc alloy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for brass that I've seen before include "Instruments, alloy" , "Metal alloy" , "Zinc-copper alloy - cheek" , "An alloy; part of orchestra" , "Family of wind instruments" .)