Fragment of bread (5)
I believe the answer is:
crumb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fragment 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 "Small bit (of comfort?)" , "Tiny piece of bread or cake" , "A shred of bread" , "tiny amount" , "Very small quantity of something, especially food" .)