Bread fragment (5)
I believe the answer is:
crumb
'bread fragment' 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 "Morsel of bread" , "Tiny piece of bread or cake" , "Small morsel" , "Very little comfort perhaps" , "Small piece of bread (or comfort!)" .)