Vehicle to move before take-off (4)

I believe the answer is:

taxi

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'vehicle' is the definition.
(I know that taxi is a type of horseless carriage)

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

Can you help me to learn more?

(Other definitions for taxi that I've seen before include "Hackney cab" , "Move along a runway" , "Cab for hire" , "Motor-cab" , "At airport, guide" .)

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

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