Awful hospital's withdrawn therapy following discharge (5)
I believe the answer is:
nasty
'awful' is the definition.
(similar in meaning)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for nasty that I've seen before include "Highly repugnant" , "Spiteful and unkind" , "One who sees the future" , "Horrible" , "Filthy" .)