Go for a drive, maybe starting tomorrow (5)

I believe the answer is:

motor

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'go for a drive' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for motor that I've seen before include "Drive" , "(Transport using) engine" , "Engine of vehicle" , "Travel by car, engine" , "Car; travel quickly" .)

I've seen this clue in the Evening Standard.

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