Crossword Genius

Key boost (5)

Ross

I believe the answer is:

tonic

This clue is a double definition.

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

'boost' is the second definition.
(tonic can mean a stimulant or booster)

(Other definitions for tonic that I've seen before include "Fillip" , "Key" , "It goes with gin" , "Keynote of a scale" , "shot in the arm" .)

I've seen this clue in The Independent.
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