Fable teacher read out loud with a lisp (4)

I believe the answer is:

myth

I'm a little stuck... Click here to teach me more about this clue!

'fable' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for myth that I've seen before include "Legend, folk tale" , "lie!" , "Fiction" , "There's no truth in it" , "Widely held misconception" .)

I've seen this clue in The Times and The Sunday Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.