Crossword Genius

Hitch-hiker's request for a tonic? (4-2-2)

Ross

I believe the answer is:

pick-me-up

I'm a little stuck... Click here to teach me more about this clue!

'for a tonic?' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pick-me-up that I've seen before include "Stimulating drink" , "A tonic to restore health or relieve depression" , "Stimulant" , "Medicinal tonic" , "Stimulative drink" .)

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