Deteriorate — as would casserole ingredients? (2,2,3)
I believe the answer is:
go to pot
'deteriorate' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
(Other definitions for go to pot that I've seen before include "run down" , "Fall into ruin" , "Become ruined" , "Tea bags will" , "Deteriorate in cooking utensil?" .)