Crossword Genius

Do forgive and have done with it! (3)

Ross

I believe the answer is:

con

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

'do' is the definition.
(both can mean to defraud)

'forgive and have done with it' is the wordplay.
I cannot quite understand how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
The remaining letters 'co' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for con that I've seen before include "Fleece" , "Study - trick" , "Swindle in draconian way" , "do something?" , "Informally swindle" .)

I've seen this clue in the Evening Standard.
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