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"wrongdoing" is also used as a crossword clue. If that's what you saw, the answer is often offence (7 letters).
Definitions
activity that transgresses moral or civil law
Word origin
From Middle English wrong doyng, wrong doynge, wrong doinge, equivalent to wrong + doing.
Used in a sentence
“A Chinese proverb goes, "He who commits wrongdoing repeatedly will come to no good end."”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Misconduct”10 letters
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