Bread bit (5)
I believe the answer is:
crumb
'bread bit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for crumb that I've seen before include "Small morsel" , "A tiny bit of bread" , "Fragment of cake, bread" , "Small piece of bread (or comfort!)" , "Tiny piece of bread or cake" .)