Crossword Genius

Battered cod boxed in air or gas (6,7)

Ross

I believe the answer is:

carbon dioxide

'gas' is the definition.
(thesaurus)

'battered cod boxed in air' is the wordplay.
'battered' indicates an anagram.
'cod'+'boxed'+'in'+'air'='codboxedinair'
'codboxedinair' is an anagram of 'CARBON DIOXIDE'.

'or' is the link.

(Other definitions for carbon dioxide that I've seen before include "Gas formed by breathing out" , "Gas for dry ice" , "This one might expire" , "gas from exhaust?" , "CO2" .)

I've seen this clue in The Guardian.
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