Dose of vitamin C arrives for the driver (2-3)

I believe the answer is:

in-car

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

'dose of vitamin c' is the definition.
The definition suggests an adjective which matches the answer.

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

Can you help me to learn more?

I've seen this clue in The Independent.

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.