More or less how one must be before leaving hospital (6,4)
I believe the answer is:
pretty well
'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" .)