Unmarried woman's criminal language (5)

I believe the answer is:

argot

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'language' is the definition.
(argot can mean jargon or slang)

I don't understand how the remainder of the clue works.

(Other definitions for argot that I've seen before include "Special language of a groat?" , "Father or mother" , "Jargon - patois" , "Patois for groat" , "Jargon or slang (of a group)" .)

I've seen this clue in The Sun.

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