The most common and most likely answer to this crossword clue is the 6 letter word FABLES
I've seen this crossword clue in The Daily Telegraph
F
A
B
L
E
S
Buddy explains!
The straight part
We know that "myths" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case myths = fables.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does FABLES mean?
FABLES noun- A fictitious narrative intended to enforce some useful truth or precept, usually with animals, etc. as characters; an apologue. Prototypically, Aesop's Fables.
- Any story told to excite wonder; common talk; the theme of talk.
- Fiction; untruth; falsehood.
- The plot, story, or connected series of events forming the subject of an epic or dramatic poem.
- To compose fables; hence, to write or speak fiction; to write or utter what is not true.
- To make up; to devise, and speak of, as true or real; to tell of falsely; to recount in the form of a fable.