Leave brief message outside? Almost! (3,5)

I believe the answer is:

not quite

'almost' is the definition.
(I've seen this in another clue)

'leave brief message outside?' is the wordplay.
'leave' becomes 'quit' (quitting is a kind of leaving).
'brief message' becomes 'note' (I've seen this in another clue).
'outside?' is an insertion indicator.
'quit' put into 'note' is 'NOT QUITE'.

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