Crossword Genius

In difficulties, I owed for fuel (8)

Ross

I believe the answer is:

firewood

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

'fuel' is the definition.
(I know that firewood is a type of fuel)

'in difficulties i owed for' is the wordplay.
'i owed for' can be anagrammed to 'FIREWOOD'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for firewood that I've seen before include "Kindling for 17 across" , "Substance for burning" , "Tinder" , "Fuel from trees" , "Logs etc for fuel" .)

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