Element in languages voiced by cardinal (8)
I believe the answer is:
tungsten
'element in languages' is the definition.
'tungsten' can be an answer for 'element' (tungsten is a kind of element). I'm not certain of the 'in languages' bit.
'voiced by cardinal' is the wordplay.
'voiced by' becomes 'tungs' (I can't explain this - if you can you should believe this answer much more).
'cardinal' becomes 'ten' (similar in meaning).
'tungs'+'ten'='TUNGSTEN'
Can you help me to learn more?
(Other definitions for tungsten that I've seen before include "Hard metal used in light bulb filaments" , "Steel-grey metal" , "Wolfram" , "Rare metallic element" , "Element used in steels" .)