Small piece of bread (5)
I believe the answer is:
crumb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small piece of bread</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for crumb that I've seen before include "Very small quantity of something, especially food" , "Small piece of bread (or comfort!)" , "A tiny bit of bread" , "Dry morsel" , "Just a little bit" .)