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 Sunday Times and The Times.

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