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 Times, The Star Tribune, The Sun, the Penny Press, the USA Today, The Irish Times and the Newsday.
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