Crossword Genius

One sort guzzling another quiet drink (4,5)

Ross

I believe the answer is:

milk shake

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'drink' is the definition.
(milk shake is a kind of drink)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for milk shake that I've seen before include "Dairy/fruit drink" , "Cold whisked drink" , "Dairy drink" , "Frothy mixed drink" .)

I've seen this clue in The Times.
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