A biscuit one gets out in a sleazy joint (9)

I believe the answer is:

digestive

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'a biscuit' is the definition.
(I've seen this before)

'one gets out in a sleazy joint' is the wordplay.
'one' becomes 'I' (Roman numeral).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'in' means one lot of letters goes inside another.
'a sleazy joint' becomes 'dive' (I've seen this before. I am not sure about the 'sleazy' bit.).
'i'+'gets'='igets'
'igets' anagrammed gives 'gesti'.
'gesti' inserted inside 'dive' is 'DIGESTIVE'.

Can you help me to learn more?

(Another definition for digestive that I've seen is " Type of biscuit".)

I've seen this clue in the Sydney Morning Herald.

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