Crossword Genius

More or less how one must be before leaving hospital (6,4)

Ross

I believe the answer is:

pretty well

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

'more or less' is the definition.
(I've seen this before)

'one must be before leaving hospital' is the wordplay.
I cannot really see how this works, but
'before' could be 'pre' (prefix meaning 'before') and 'pre' is located in the answer.
This explanation may well be incorrect...

'how' acts as a link.

Can you help me to learn more?

(Other definitions for pretty well that I've seen before include "Practically" , "Aim of dressing in Derbyshire" , "Close to" , "More or less" , "Sort of" .)

I've seen this clue in the Evening Standard.
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