Fuel, in the main hers, not for working large stoves (5-3,3)

'fuel' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'the main hers not for working large stoves' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'main' could be 'gas' (gas main is a kind of main) and 'gas' is found in the answer.
an anagram of 'hers' is 'rhse' which is located in the remaining letters.
'not' could be 'no' (negative) and 'no' is found in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?