Crossword Genius

Cess on one car (for hire) (4)

Ross

I believe the answer is:

taxi

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

'car for hire' is the definition.
(I've seen this before)

'cess on one' is the wordplay.
'cess on' becomes 'tax' (I am not sure about this - if you are sure you should believe this answer much more).
'one' becomes 'i' (Roman numeral).
'tax'+'i'='TAXI'

Can you help me to learn more?

(Other definitions for taxi that I've seen before include "Motor-cab" , "Hired vehicle" , "Motor cab" , "move slowly along the ground" , "Hackney carriage" .)

I've seen this clue in The Hindu.
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