Can material (8)
(Other definitions for aluminum that I've seen before include "Most abundant metal in the earth's crust" , "Light silvery metal, to an American" , "metal from overseas" .)
'can material' 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-white metal used in cans" , "A silvery-white metal, symbol Sn" , "A silvery-white metal often in cans" , "With copper, makes bronze" , "Atomic number 50" .)