New law from producing metal (7)
I believe the answer is:
wolfram
'metal' is the definition.
(wolfram is a kind of metal)
'new law from' is the wordplay.
'new' indicates anagramming the letters.
'law'+'from'='lawfrom'
'lawfrom' is an anagram of 'WOLFRAM'.
'producing' is the link.
(Other definitions for wolfram that I've seen before include "Tungsten" , "at no 74, originally" , "elemental" , "hard stuff" , "Element by another name" .)