Brittle (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brittle</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 crisp that I've seen before include "brief" , "Snappy" , "Fresh and bracing" , "food in packet" , "Firm and fresh or easily crumbled" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brittle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for frangible that I've seen before include "Fragile, brittle" , "Easily broken -- gerbil fan (anag)" .)