Mistaken or guilty (2,3,5)

I believe the answer is:

in the wrong

I believe this is a double definition.

'mistaken' is the first definition.
(I've seen this in another clue)

'guilty' is the second definition.
(I've seen this before)

(Other definitions for in the wrong that I've seen before include "At fault" , "Guilty of error" .)

I've seen this clue in The Mirror.

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