Piece of evidence found at the baker's (10)
I believe the answer is:
breadcrumb
'piece' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's an association between them I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for breadcrumb that I've seen before include "Loaf fragment" , "Tiny piece of a loaf" , "little food" , "Particle of a loaf" , "Bit of a loaf?" .)