Show contempt for hospital food (4)
I believe the answer is:
dish
'food' is the definition.
(dish is a kind of food)
'show contempt for hospital' is the wordplay.
'show contempt for' becomes 'dis'.
'hospital' becomes 'h'.
'dis'+'h'='DISH'
(Other definitions for dish that I've seen before include "Attractive person" , "Particular item of prepared food" , "Menu item - plate" , "Spoil" , "Peach" .)