Improbable tale (4,5)

I believe the answer is:

tall story

(Other definitions for tall story that I've seen before include "Unlikely tale" , "Unbelievable yarn" , "suggesting Jack and the Beanstalk?" , "Lie" , "Fiction" .)

I've seen this clue in The Guardian and the Sydney Morning Herald.

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.