Holy chalice of legend
I believe the answer is:
grail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">holy chalice of legend</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 grail that I've seen before include "Cherished goal" , "Arthurian knights' quest" , "Holy object of search" , "Object of King Arthur's quest" , "sought by Parsifal" .)