Crossword Genius

Small gangs arranging an inside job in stir? (5)

Ross

I believe the answer is:

trios

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

But I can't explain it at all! Could you help me understand?

(Other definitions for trios that I've seen before include "Works for three players" , "Groups of three" .)

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.