Copper or tin (5)
I believe the answer is:
metal
I believe this is a double definition.
'copper' is the first definition.
(I've seen this before)
'tin' is the second definition.
(thesaurus)
(Other definitions for metal that I've seen before include "Gold or silver in heraldry" , "Copper or silver, say" , "Element such as iron, copper, zinc etc" , "Copper, perhaps" , "employed in making roads" .)