Frustrate plot the writer's kept hidden? (11)

I believe the answer is:

countermine

I'm a little stuck... Click here to teach me more about this clue!

'frustrate' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their base form.
Perhaps you can see a link between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for countermine that I've seen is " Frustrating plot".)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.