23 across
Outrageously
wicked
criminal
in
house
(7)
Outrageously wicked criminal in house (7)
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The definition is at the beginning of the clue.
How the clue works
Outrageously wicked is your definition, pointing to something shockingly evil. "Criminal" is doing the anagram-indicator work here, so jumble up the letters of in house and you'll find your answer hiding in there.