The legendary sword of King Arthur (9)
I believe the answer is:
excalibur
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the legendary sword of king arthur</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for excalibur that I've seen before include "Traditional weapon" , "King Arthur's magic sword" , "King Arthur's magical sword" , "The legendary sword of King Arthur" , "Steel flourished years ago" .)