Crossword Genius

Complain open clothes will show boob (9)

Ross

I believe the answer is:

oversight

I'm a little stuck... Click here to teach me more about this clue!

'boob' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'complain open clothes will show' is the wordplay.
I cannot really understand how this works, but
'show' could be 'sight' (I've seen this before) and 'sight' is located in the answer.
The remaining letters 'over' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for oversight that I've seen before include "Failure to notice - supervision" , "error" , "Shot giver due to unintentional omission" , "Supervision - omission" , "Supervisor's charged with this" .)

I've seen this clue in The Independent.
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