How to call the band! (4)

I believe the answer is:

ring

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

'band' is the definition.
(a ring is a band of metal)

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

(Other definitions for ring that I've seen before include "Phone; circle" , "Circus space; surround" , "Circle that's square for boxers" , "'It's a square, strangely, for boxers (4)'" , "Call - cartel" .)

I've seen this clue in the Sydney Morning Herald.

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.