A drink or two (6)

I believe the answer is:

double

I believe this clue is a double definition.

'a drink' is the first definition.
(double shot of alcohol)

'two' is the second definition.
(thesaurus)

'or' is the link.

(Other definitions for double that I've seen before include "Spitting image" , "understudy" , "Multiply by two" , "With two equal parts" , "Person who says one thing and does another" .)

I've seen this clue in the Evening Standard.

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