Tin or titanium, eg (5)
I believe the answer is:
metal
This clue is a double definition.
'tin' is the first definition.
(thesaurus)
'titanium eg' is the second definition.
(titanium is a kind of metal)
(Other definitions for metal that I've seen before include "Material detectable in the ground" , "Headbanger's music genre" , "Copper or silver, say" , "Zirconium, for example" , "Like steel cutlery" .)