Not manage to think straight, so find nothing to go with gin (2,3,2,2)

I believe the answer is:

be out of it

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'not manage' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'to think straight so find nothing to go with gin' is the wordplay.
I cannot quite see how this works, but
'to' is present in the answer.
'nothing' could be 'o' (O resembles 0) and 'o' is located in the answer.
'go' could be 'fit' (synonyms) and 'fit' is located in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Times.

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