Crossword Genius

Phone up endlessly? (4)

Ross

I believe the answer is:

ring

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

'phone' is the definition.
(to ring on the phone)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ring that I've seen before include "Call; circle" , "13's story of a 17" , "Besiegers' formation" , "Contact" , "Wedding band" .)

I've seen this clue in the Evening Standard.
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