The cantankerousness I'm going to indulge (9)
I believe the answer is:
illhumour
'the cantankerousness' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'i'm going to indulge' is the wordplay.
I cannot really see how this works, but
'i'm' could be 'i' (I've seen this in other clues) and 'i' is present in the answer.
'indulge' could be 'humour' (humouring is a kind of indulging) and 'humour' is located in the answer.
'going to' could be 'll' (as in he'll, we'll etc) and 'll' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
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