Pewter component (3)
I believe the answer is:
tin
'pewter component' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tin that I've seen before include "Silvery metallic element" , "Canister" , "Atomic number 50" , "roofing material" , "Kind of metal often used as food container" .)