Crossword Genius

Sound produced by the bookmaker (6)

Ross

I believe the answer is:

volume

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'sound' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for volume that I've seen before include "Publication" , "Aggregate" , "The bulk" , "A book or sound dimension" , "reading matter?" .)

I've seen this clue in The Irish Times.
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