Something that invigorates (5)

I believe the answer is:

tonic

(Other definitions for tonic that I've seen before include "Small drink of spirits" , "something invigorating" , "Important note" , "Invigorating medicine - keynote" , "Gin mixer - pick-me-up" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.