Unwell actor Jonah leaves hospital (3)
I believe the answer is:
ill
'unwell' is the definition.
(similar in meaning)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for ill that I've seen before include "reduced state" , "Shakespeare: '. . . met by moonlight'" , "Dicky" , "Misfortune" , "In short, the state of Chicago" .)