Crossword Genius

I'll be hanged if I do? Not so! (5,3,7)

Ross

I believe the answer is:

cheat the gallows

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

'i'll be hanged if i' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'do? not so' is the wordplay.
I cannot really see how this works, but
'do?' could be 'cheat' (do can mean to cheat or defraud) and 'cheat' is found within the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Telegraph.
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