Crossword Genius

Was said without thinking, as one left (7,3)

Ross

I believe the answer is:

slipped out

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

'was said without thinking' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'one left' is the wordplay.
I cannot really see how this works, but
'one' could be 'li' (I've seen this in other clues) and 'li' is present in the answer.
This may be the basis of clue (or it may be nonsense).

'as' acts as a link.

Can you help me to learn more?

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