Tin or silver
I believe the answer is:
metal
This clue is a double definition.
'tin' is the first definition.
(thesaurus)
'silver' is the second definition.
(I've seen this in another clue)
(Other definitions for metal that I've seen before include "lead as one" , "Copper possibly" , "Eg, titanium" , "Lead or iron, perhaps" , "Alloy" .)