Mistake from Mister Rorschach (5)

I believe the answer is:

error

'mistake' is the definition.
(I know that mistake can be written as error)

'from mister rorschach' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ERROR' is hidden within 'mister rorschach'.

(Other definitions for error that I've seen before include "Boob" , "Gaffe" , "Faux pas" , "Mistake, lapse" , "A mistake or inaccuracy" .)

I've seen this clue in The Sun.

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