Brittle sweet (12)
I believe the answer is:
butterscotch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brittle sweet</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 butterscotch that I've seen before include "Brittle, yellow-brown sweet" , "confectionery" , "Hard brittle toffee" , "Type of toffee" , "Kind of toffee" .)