Crossword Genius

Make heavy demands on one vehicle (4)

Ross

I believe the answer is:

taxi

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

'make heavy demands on one' is the wordplay.
'make heavy demands on' becomes 'tax' (I've seen this before).
'one' becomes 'i' (Roman numeral**).
'tax'+'i'='TAXI'

(Other definitions for taxi that I've seen before include "Minicab" , "Part of fleet" , "type of vehicle" , "Public service vehicle" , "Motor cab" .)

I've seen this clue in The Telegraph.
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