Crossword Genius

Rat, perhaps involved with riot? (7)

Ross

I believe the answer is:

traitor

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

'rat' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for traitor that I've seen before include "Betrayer, deceiver" , "defector?" , "Treasonous individual" , "Maclean was one" , "One committing treason" .)

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.