A guard takes the Nottingham sheriff to the dungeons to show him a prisoner.
The guard: I think you should see this. He's been acting like this since
you brought him in. He's up to no good. There.
Sheriff: What? He's not doing anything.
The guard: That's how I know. They never do nothing. They always try something.
Something's wrong. With your permission, my lord, I'd like
to have him hanged sooner rather than later.
Sheriff: What's that around his neck? (To the prisoner) What is it, pretty boy?
The guard: Must be some sort of heathen magic. I don't like it. And I don't like him.
Sheriff: I'm glad you got me here for this.
The guard: Thank you, my lord.
Sheriff: A clue - no. The next time you get me here for no reason,
I shall see you inside the cell, not outside it.
What do the underlined parts mean?