Whom Jason jilted (5)
I believe the answer is:
medea
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">whom jason jilted</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 medea that I've seen before include "Tragedy by Euripides" , "Tragic heroine" , "Jason's sorceress" , "Mythical wife who helped Jason get the Golden Fleece" , "Greek princess who helped Jason get the Golden Fleece" .)