About to see something you've missed (9)

I believe the answer is:

oversight

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'something you've missed' is the definition.
I can't judge whether this definition defines the answer.

'about to see' is the wordplay.
'about' becomes 'over' (I've seen this before).
'to see' becomes 'sight' (I've seen this before).
'over'+'sight'='OVERSIGHT'

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(Other definitions for oversight that I've seen before include "Shot giver due to unintentional omission" , "Inadvertent mistake" , "error" , "Supervisor's charged with this" , "Management" .)

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