Crossword Genius

Vodka doses up pint-sized soft drink (4)

Ross

I believe the answer is:

soda

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'soft drink' is the definition.
(I know that soft drink can be written as soda)

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

Can you help me to learn more?

(Other definitions for soda that I've seen before include "Mixer drink" , "Drink containing carbonated water and sometimes flavouring" , ""Splashed" drinks mixer" , "fizz" , "pressurised liquid" .)

I've seen this clue in the Sydney Morning Herald.
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