Medicine that may be mixed with gin (5)

I believe the answer is:

tonic

This clue is a double definition.

'medicine' is the first definition.
(tonic is a kind of medicine)

'that may be mixed with gin' is the second definition.
(I've seen this before)

(Other definitions for tonic that I've seen before include "Gin mixer - pick-me-up" , "Quinine water" , "something providing a boost" , "makes you feel good?" , "Stimulant" .)

I've seen this clue in The Globe and Mail and The Telegraph.

Want a hint initially instead of a full solution? Install my app