Health food (5)
I believe the answer is:
This clue is a double definition.
'health' is the first definition.
(I've seen this before)
'food' is the second definition.
(toast is a kind of food)
(Other definitions for toast that I've seen before include "Celebrate" , "It's found under marmalade and butter" , "Browned bread; health" , "Heat bread" , "Raising of glasses" .)