Iron or lead (5)
I believe the answer is:
metal
I believe this is a double definition.
'iron' is the first definition.
(I've seen this before)
'lead' is the second definition.
(lead is a metal)
(Other definitions for metal that I've seen before include "Broken stones" , "Maybe lead" , "Lead or iron, perhaps" , "Gold or silver in heraldry" , "Zirconium, for example" .)