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Stimulant, usually after a gin (5)

Ross

I believe the answer is:

tonic

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'stimulant' is the definition.
(I've seen this before)

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

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(Other definitions for tonic that I've seen before include "makes you feel good?" , "Keynote of a scale" , "Stimulus" , "requirement for invigoration?" , "Quinine water" .)

I've seen this clue in The Mirror.
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