Crossword Genius

Preposterous list often added to with conviction? (8,6)

Ross

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8

8,6
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'preposterous' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?

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

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(Other definitions for criminal that I've seen before include "Person who breaks the law for a living" , "hood" , "A bad hat" , "An habitual breaker of the law" , "Deplorable, shocking" .)

I've seen this clue in The Guardian.
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