Car's road test, alternatively (5)

I believe the answer is:

motor

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'car's' is the definition.
(motor can informally mean a car)

'road test alternatively' is the wordplay.
'road test' becomes 'mot' (as in an MOT test for a vehicle. I am not sure about the 'road' bit.).
'alternatively' becomes 'or'.
'mot'+'or'='MOTOR'

Can you help me to learn more?

(Other definitions for motor that I've seen before include "Engine of vehicle" , "Wheels" , "Car; powered machine" , "Car; travel quickly" , "Engine - relating to movement" .)

I've seen this clue in The Mirror.

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