Crossword Genius

HS2, missing both ends, has party members instigating plots (7)

Ross

I believe the answer is:

stories

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'plots' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stories that I've seen before include "House sections" , "For example, scoops" , "Floors" , "See 12" , "See 21" .)

I've seen this clue in The Guardian.
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