It's a long story (4)

I think it could be either:

yarn

saga

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'long story' is the definition.

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

(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 Guardian, the USA Today, the Universal, the Newsday, The Wall Street Journal, The Washington Post, The New York Times and the Evening Standard.

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