Crossword Genius

One may put one's foot down using this vehicle (7)

Ross

I believe the answer is:

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'vehicle' is the definition.
(scooter is a kind of vehicle)

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

Can you help me to learn more?

(Other definitions for scooter that I've seen before include "Traveller", "one makes off quickly", "Light motorcycle", "it may need physical boost", "Vehicle and child's toy".)

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