Crossword Genius

Gas that could make Noel rich (8)

Ross

I believe the answer is:

chlorine

'gas' is the definition.
(I know that chlorine is a type of gas)

'could make noel rich' is the wordplay.
'could make' indicates anagramming the letters.
'noel'+'rich'='noelrich'
'noelrich' with letters rearranged gives 'CHLORINE'.

'that' acts as a link.

(Other definitions for chlorine that I've seen before include "element - that's dangerous!" , "Toxic green gas" , "Gas used in STERILISING water and in industry (8)" , "Poison gas, with sodium makes salt" , "Halogen gas, Cl" .)

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