Crossword Genius

Amazon fish treats cooked under gas (4,6)

Ross

I believe the answer is:

neon tetras

'amazon fish' is the definition.
(fish that live in the Amazon)

'treats cooked under gas' is the wordplay.
I cannot really see how this works, but
an anagram of 'treats' is 'tetras' which is within the answer.
'gas' could be 'neon' (neon is a gas) and 'neon' is found within the answer.
No letters remain.
This explanation may well be incorrect...

I've seen this clue in The Guardian.
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