Broken humeri punctured by new metal (7)
I believe the answer is:
rhenium
'metal' is the definition.
(rhenium is a kind of metal)
'broken humeri punctured by new' is the wordplay.
'broken' indicates an anagram.
'punctured by' indicates putting letters inside (inserted letters puncture into the word).
'new' becomes 'n' (abbreviation as in New Testament NT).
'humeri' with letters rearranged gives 'rheium'.
'rheium' placed around 'n' is 'RHENIUM'.
(Other definitions for rhenium that I've seen before include "Chemical" , "Metal" , "Element (Re)" .)