Metal in bronze (3)
I believe the answer is:
tin
'metal in bronze' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tin that I've seen before include "Silvery metallic element" , "loaf of bread" , "Silver-white metal, used to make cans" , "Silvery-white metallic element" , "Canister" .)