The most common and most likely answer to this crossword clue is the 4 letter word MYTH
I've seen this crossword clue in The Times
M
Y
T
H
More clues leading to the result MYTH
- Timmy Thompson’s secret fantasy
- Gosh! Half of that is fiction!
- Violet Elizabeth’s to feel the want of not having story?
- False belief held by academy there
- Jeremy Thorpe's inner fantasy
- Fancy being given most of the story
- Legend presented in crummy theatre
- Academy that houses folklore
- The legend of Hop-o’-my-Thumb
- This writer's continuing with the unfinished story
Buddy explains!

The straight part
We know that "fantasy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fantasy = myth.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 MYTH mean?
MYTH noun- A traditional story which embodies a belief regarding some fact or phenomenon of experience, and in which often the forces of nature and of the soul are personified; a sacred narrative regarding a god, a hero, the origin of the world or of a people, etc.
- Such stories as a genre.
- A commonly-held but false belief, a common misconception; a fictitious or imaginary person or thing; a popular conception about a real person or event which exaggerates or idealizes reality.
- A person or thing held in excessive or quasi-religious awe or admiration based on popular legend
- A person or thing existing only in imagination, or whose actual existence is not verifiable.