Crossword Genius

Swindle prisoner (3)

Ross

I believe the answer is:

con

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'prisoner' is the definition.
(abbreviation for 'convict')

I cannot understand how the rest of the clue works.

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(Other definitions for con that I've seen before include "one in pen?" , "Peruse carefully or swindle" , "Study - swindle" , "Swindle or see" , "Swindle in draconian way" .)

I've seen this clue in The Mirror.
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