A sweet (4)
I believe the answer is:
mint
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a sweet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(mint is a kind of sweet)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for mint that I've seen before include "sweet herb" , "fortune" , "Forge" , "and 18 Down: Southern US cocktail" , "Large sum of money" .)