Thin crisp biscuit (5)
I believe the answer is:
wafer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thin crisp biscuit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for wafer that I've seen before include "Very thin slice" , "Light thin biscuit" , "Communion bread" , "Ice cream biscuit" , "Ice cream's biscuit" .)