Crossword Genius

Multiply a drink (6)

Ross

I think it could be either:

treble

double

This clue is a double definition.

'multiply' is the first definition.
(I know that treble is a more specific form of the action multiply)

'a drink' is the second definition.

(Other definitions for treble that I've seen before include "High voice; occurring three times" , "High-frequency (radio control knob)" , "High darts score" , "high frequency" , "Threefold; boy's voice" .)

I've seen this clue in The Mirror.
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