Crossword Genius

The outback is in open country, you need a car (5)

Ross

I believe the answer is:

motor

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for motor that I've seen before include "Drive" , "Driver" , "Make good progress" , "Wheels" , "Travel by car, engine" .)

I've seen this clue in the Evening Standard.
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