Mythical story, fable (6)
I believe the answer is:
legend
I believe this clue is a double definition.
'mythical story' is the first definition.
(I've seen this before)
'fable' is the second definition.
(I know that fable can be written as legend)
(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" .)