Crossword Genius

I am after a levy for transport (4)

Ross

I believe the answer is:

taxi

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'for transport' is the definition.
(taxi is a kind of transport)

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 "run along the ground" , "Car for hire" , "Part of fleet" , "Prepare to take off" , "Motor-cab" .)

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