Mythical story, fable (6)
I believe the answer is:
legend
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">mythical story</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">fable</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that fable can be written as legend)</span><br/ ><br/ ></span>
(Other definitions for legend that I've seen before include "Myth or map symbol" , "Traditional story; caption" , "Traditional story or myth" , "Very famous member's death" , "explanation" .)