Uneven withdrawals in account fraud (3)

I believe the answer is:

con

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'fraud' is the definition.
(con is a kind of fraud)

I don't understand the remainder of the clue.

(Other definitions for con that I've seen before include "Direct steering; study" , "Trick, deceive" , "Swindle in draconian way" , "Swindle or trick someone" , "Learn; swindle" .)

I've seen this clue in the Sydney Morning Herald.

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