Some elements of roofing material put back after vandalism - at last (6)
I believe the answer is:
metals
'some elements' is the definition.
(metal is a kind of element)
'roofing material put back after vandalism at last' is the wordplay.
'roofing material' becomes 'slate' (slate is a kind of roofing material).
'put back' says the letters should be written backwards.
'after' says to put letters next to each other.
'at last' says to take the final letters.
The last letter of 'vandalism' is 'm'.
'slate' written backwards gives 'etals'.
'etals' put after 'm' is 'METALS'.
'of' is the link.
(Other definitions for metals that I've seen before include "Silver and platinum, say" , "Copper, tin and iron" , "Gold and silver, say" , "Silver and aluminium, say" , "Such as iron, gold, etc" .)