Lengthy story's thread (4)

I believe the answer is:

yarn

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

This might be a double definition.

'lengthy story's' is the first definition.
'yarn' can be an answer for 'story's' (synonyms). I'm not certain of the 'lengthy' bit.

'thread' is the second definition.
(I know that thread can be written as yarn)

Can you help me to learn more?

(Other definitions for yarn that I've seen before include "Tale; weave" , "Exaggerated story or spun thread" , "Rambling story" , "A long tale" , "Anecdote" .)

I've seen this clue in The Telegraph.

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.