Mass of bread (4)
I believe the answer is:
loaf
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mass of bread</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for loaf that I've seen before include "bloomer, perhaps" , "loll" , "Bum about" , "BRINK/BRICK" , "Quantity of bread" .)