Food in bed is heaven (4)
I believe the answer is:
dish
'food' is the definition.
(dish is a kind of food)
'in bed is heaven' is the wordplay.
'in' indicates a hidden word.
'DISH' is hidden within 'bed is heaven'.
(Other definitions for dish that I've seen before include "Peach" , "Sky can be seen through this" , "Ruin" , "Receptacle" , "Satellite aerial" .)