Tungsten for two animals? (7)
I believe the answer is:
wolfram
'tungsten' is the definition.
(synonyms)
'two animals?' is the wordplay.
'two animals?' means two replacements for 'animal'.
'animal' becomes 'wolf' (I have seen 'Predatory animal' mean 'wolf' so perhaps 'animal' could also mean 'wolf').
'animal' becomes 'ram' (male sheep).
'wolf'+'ram'='WOLFRAM'
'for' acts as a link.
(Other definitions for wolfram that I've seen before include "Element by another name" , "elemental" , "hard stuff" , "Heavy metal" , "at no 74, originally" .)