Crossword Genius

Drink for look-alike (6)

Ross

I believe the answer is:

double

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This clue might be a double definition.

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

'look-alike' is the second definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'for' is the link.

Can you help me to learn more?

(Other definitions for double that I've seen before include "Two times" , "Offence of leaving one's car where it blocks another" , "Second charge for the same offence" , "Twice - bent over - run" , "Ringer - large drink" .)

I've seen this clue in The Mirror.
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