Crossword Genius

Go wrong, note, having only two-thirds basic education (3)

Ross

I believe the answer is:

err

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'go wrong' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for err that I've seen before include "Drop a clanger" , "Leave the straight and narrow" , "Blunder" , "Slip up" , "Deviate" .)

I've seen this clue in the Evening Standard.
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