Crossword Genius

Enquiry ended early on ring with no charges (3,4)

Ross

I believe the answer is:

pro bono

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'with no charges' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pro bono that I've seen before include "Giving free services" , "not being paid" , "For the public good - ... .... publico" , "Done for the public good unpaid" , "with no charges" .)

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