Crossword Genius

...it may be required to create narrative thread (4)

Ross

I believe the answer is:

yarn

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'thread' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

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(Other definitions for yarn that I've seen before include "that'll keep you in stitches?" , "Sort of tale" , "Anecdote" , "Tale; weave" , "Spun fibre" .)

I've seen this clue in The Irish Times.
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