HS2, missing both ends, has party members instigating plots (7)
I believe the answer is:
stories
'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" .)