Crossword Genius

From bad to worse in terms of eating and heating? (3,2,3,6,3,4,3,4)

Ross

I believe the answer is:

out of the frying pan into the fire

I'm a little stuck... Click here to teach me more about this clue!

'from bad to worse' is the definition.
(idiomatic phrase)

'in terms of eating and heating?' is the wordplay.
I cannot quite understand how this works, but
'in' is within the answer.
'of' could be 'o' and 'o' is located in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for out of the frying pan into the fire that I've seen before include "making matters worse? - with 17a" , "Where badly burnt sausages may need to go" .)

I've seen this clue in The Guardian.
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