Bad organisation (5)

I believe the answer is:

mafia

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'bad organisation' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

This is the entire clue.

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(Other definitions for mafia that I've seen before include "Criminal society" , "Our family" , "International crime organisation originating in Sicily" , "Sicilian one" , "The Sicily mob" .)

I've seen this clue in the Evening Standard.

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