Crossword Genius

According to reporter, East End trio's at large (4)

Ross

I believe the answer is:

free

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

'at large' is the definition.
(similar in meaning)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for free that I've seen before include "without payment" , "Rescue" , "Under no obligation" , "Reef (anag.)" , "Not under restraint" .)

I've seen this clue in The Guardian.
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.