Lead or tin (5)
I believe the answer is:
metal
This clue is a double definition.
'lead' is the first definition.
(lead is a metal)
'tin' is the second definition.
(thesaurus)
(Other definitions for metal that I've seen before include "Intrinsic quality; stone for roads" , "Copper, perhaps" , "Lead, say" , "Musically it can be heavy" , "Conducting solid" .)