Crossword Genius

With which, up to no good, one tripped over the camp-stool? (4,6)

Ross

I believe the answer is:

fell intent

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

'tripped over the camp-stool?' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'with which up to no good one' is the wordplay.
I cannot quite understand how this works, but
'no' could be 'n' (common abbreviation) and 'n' is found in the answer.
'one' could be 'li' (I've seen this in other clues) and 'li' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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