Crossword Genius

Quickly downed five in Le Café, we hear (4)

Ross

I believe the answer is:

sank

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'quickly downed' is the definition.
The answer and definition can be both to do with contact as well as being past participle verbs.
Perhaps there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sank that I've seen before include "Fell to the bottom" , "(Of ship) went down" , "Scuttled" , "Foundered" , "Subsided" .)

I've seen this clue in The Independent.
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