Unacceptable in the south (3)

I believe the answer is:

out

'unacceptable' is the definition.
(out can mean incorrect or inappropriate)

'in the south' is the wordplay.
'in' says the answer is hidden in the clue.
'OUT' is hidden within 'south'.

(Other definitions for out that I've seen before include "SECOND PART OF 16" , "In error" , "Disnmissed (cricket)" , "No longer in prison" , "Possibly caught" .)

I've seen this clue in The Mirror.

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