Is this your crossword clue?
"mistaken" is also used as a crossword clue. If that's what you saw, the answer is often erring (6 letters).
Definitions
arising from error
Used in a sentence
“I'm frequently mistaken for my brother.”
“A mistaken sense of loyalty.”
“I think you must be (very) much mistaken.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“error-born”8 letters
Not quite right?
"Search similar patterns."
M_______