Crossword Genius

Make a mistake in the manner reckoned (3)

Ross

I believe the answer is:

err

'make a mistake' is the definition.
(to err is to make an error)

'in the manner reckoned' is the wordplay.
'in' indicates a hidden word.
'ERR' is hidden in the letters of 'manner reckoned'.

(Other definitions for err that I've seen before include "Be mistaken" , "Blunder" , "Boob" , "Go astray" , "Be incorrect" .)

I've seen this clue in the Sydney Morning Herald.
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