My tribute about a metal (9)
I believe the answer is:
ytterbium
'a metal' is the definition.
(I know that ytterbium is a type of metal)
'my tribute about' is the wordplay.
'about' indicates an anagram.
'my'+'tribute'='mytribute'
'mytribute' anagrammed gives 'YTTERBIUM'.
(Other definitions for ytterbium that I've seen before include "Rare-earth element" , "Element with symbol Yb" , "SEVENTY" , "Atomic number 70" , "metal" .)