Crossword Genius

Be mistaken (3)

Ross

I believe the answer is:

err

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

This is the entire clue.

(Other definitions for err that I've seen before include "Stray from the straight and narrow" , "Miscalculate" , "Blunder" , "Boob" , "Make a wrong move" .)

I've seen this clue in The Irish Times, the Penny Press, The Times, the USA Today, the Newsday, The Star Tribune and The Sun.
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