Crossword Genius

Getting round in, Richter's ordered a treble? (9)

Ross

I believe the answer is:

chorister

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'getting' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for chorister that I've seen before include "Church, cathedral singer" , "Choirboy or girl" , "Boy singing" , "Boy in church" , "Boy singer" .)

I've seen this clue in The Times.
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