A stuffed tortilla baked in sauce, often with a cheese topping (9)
I believe the answer is:
enchilada
'topping' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's an association between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for enchilada that I've seen before include "hot dish" , "Hot food" , "Mexican food" , "Mexican dish" , "Tortilla with meat and chilli" .)