Granite's crushed to produce neon or argon (5,3)
I believe the answer is:
inert gas
'produce neon or argon' is the definition.
I can't judge whether this definition defines the answer.
'granite's crushed' is the wordplay.
'crushed' indicates anagramming the letters.
'granites' anagrammed gives 'INERT GAS'.
'to' is the link.
Can you help me to learn more?
(Other definitions for inert gas that I've seen before include "Passive element in the helium group" , "one at the edge of a table" , "Eg, krypton or argon" , "Eg, helium, xenon etc." , "Such as neon or xenon" .)