Insanity (7)

I believe the answer is:

madness

'insanity' is the definition.
(I know that insanity can be written as madness)

This is the entire clue.

(Other definitions for madness that I've seen before include "great anger" , "Irrationality" , "Lunacy - ska/pop band" , "Group" , "Folly" .)

I've seen this clue in the Sydney Morning Herald, The Times, The Mirror, the Evening Standard and The Telegraph.

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