Crossword Genius

Car — nothing right after its test? (5)

Ross

I believe the answer is:

motor

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

I cannot understand how the remainder of the clue works.

(Other definitions for motor that I've seen before include "go quickly" , "Drive" , "Car (informal)" , "Move fast" , "Make good progress" .)

I've seen this clue in The Times.
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