Sweetbread? (5)
I believe the answer is:
lolly
'sweetbread' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?
This is all the clue.
(Other definitions for lolly that I've seen before include "Cash (slang)" , "Money (informal)" , "Moolah" , "Loot, dosh" , "dough" .)