Concern among all other people leaving hospital (8)
I believe the answer is:
interest
'concern' is the definition.
(interesting is a kind of concerning)
'among all other people leaving hospital' is the wordplay.
I cannot quite see how this works, but
'among' could be 'in' (I've seen this in other clues) and 'in' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for interest that I've seen before include "Principal" , "Attract - curiosity" , "Pursuit" , "Diversion" , "importance" .)