Crossword Genius

Vehicle could be an imposition on one (4)

Ross

I believe the answer is:

taxi

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

'an imposition on one' is the wordplay.
'an imposition on' becomes 'tax' (I can't explain this - if you can you should give a lot more credence to this answer).
'one' becomes 'i' (Roman numeral).
'tax'+'i'='TAXI'

'could be' is the link.

Can you help me to learn more?

(Other definitions for taxi that I've seen before include "move slowly along the ground" , "Public service vehicle" , "US currency" , "Car for hire" , "run along the ground" .)

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