Divide stuff that is found inside (2,3)

I believe the answer is:

id est

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'inside' is the definition.
Both the answer and definition are adverbs. Maybe you can see an association between them that I can't see?

'divide stuff that is found' is the wordplay.
'is found' indicates the answer is hidden within the clue.
'ID EST' is hidden within 'divide stuff that'.

Can you help me to learn more?

(Other definitions for id est that I've seen before include "I mean to say!" , "In other words" , "Ie, in full" , "Namely" , "That is to say (Latin)" .)

I've seen this clue in The Guardian.

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