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It's a long story (4)


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'a long story' is the definition.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for yarn that I've seen before include "Story, and thread or wool, say" , "Long involved story" , "Rope" , "Rambling story" , "Spun thread; long story" .)

I've seen this clue in The Wall Street Journal, The New York Times, the Evening Standard, the Universal and The Guardian.
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