Crossword Genius

Be mistaken (3)

Ross

I believe the answer is:

err

'be mistaken' is the definition.
(I've seen this before)

This is all the 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 Sun, The Star Tribune, the Newsday, the USA Today, the Penny Press and The Times.
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