Crossword Genius

Inadvertent mistake concerning vision (9)

Ross

I believe the answer is:

oversight

'inadvertent mistake' is the definition.
(something somebody overlooked)

'concerning vision' is the wordplay.
'concerning' becomes 'over' (both can mean relating to).
'vision' becomes 'sight' (synonyms).
'over'+'sight'='OVERSIGHT'

(Other definitions for oversight that I've seen before include "Mistake resulting from inattention" , "Neglect" , "Failure to notice - blunder" , "Supervisor's charged with this" , "Shot giver due to unintentional omission" .)

I've seen this clue in The Telegraph.
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