Crusty loaf (7)
I believe the answer is:
bloomer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crusty loaf</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 bloomer that I've seen before include "A loaf; an error" , "A slangy blunder or flower in blossom" , "Stupid error (colloq.)" , "rose, say" , "Big mistake" .)