Insult hospital food (4)
I believe the answer is:
dish
'food' is the definition.
(dish is a kind of food)
'insult hospital' is the wordplay.
'insult' becomes 'dis' (shortened form of 'disrespect' - slang).
'hospital' becomes 'h'.
'dis'+'h'='DISH'
(Other definitions for dish that I've seen before include "receiver to >screw up" , "Kitchen container" , "course" , "One who's fetching" , "Shallow bowl" .)