Discover not to be at home?

I think it could be either:

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4,3

findout

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'discover' is the definition.
(finding out is a kind of discovering)

'not to be at home?' is the wordplay.
I cannot quite see how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'at' could be 'in' and 'in' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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