Acidic (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">acidic</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 tart that I've seen before include "fruit in this dish" , "quiche, perhaps" , "Professional woman" , "Pie with fruit filling" , "Of taste, sharp or acid" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">acidic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sour that I've seen before include "Acid-tasting" , "Acid tasting" , "Acetic" , "'Having a sharp, biting taste (4)'" , "Curdled" .)