Crossword Genius

Groups of competitors (5)

Ross

I believe the answer is:

teams

(Other definitions for teams that I've seen before include "Groups or troupes" , "Groups of people working together" , "Crews" , "Squads" , "Sports sides" .)

I've seen this clue in The Independent.
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.