Crossword Genius

One drink much like another? (6)

Ross

I believe the answer is:

double

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'one drink' is the definition.
(I have seen 'Large drink' mean 'double' so perhaps 'drink' could also mean 'double')

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

Can you help me to learn more?

(Other definitions for double that I've seen before include "Person who says one thing and does another" , "Bed for two people" , "Twice the amount" , "Offence of leaving one's car where it blocks another" , "Make twice as many" .)

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