Food that can be drunk (5)
I believe the answer is:
toast
'food' is the definition.
(toast is a kind of food)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for toast that I've seen before include "cooked 13 [BREAD]" , "Breakfast slice" , "Drink to the healt of" , "Tribute (plus a clinking of glasses?)" , "Food (that one can drink!)" .)