Insane (3)

I think it could be either:

Which length description are you looking for?:

mad

'insane' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for mad that I've seen before include "lunatic" , "Crazed" , "Demented or excited or angry" , "Angry or insane" , "Berserk" .)

I've seen this clue in The Mirror, The Independent, the Evening Standard and The Telegraph.

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