Dermot O'Reilly's car? (5)

I believe the answer is:

motor

I'm a little stuck... Click here to teach me more about this clue!

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

'dermot o'reilly's' is the wordplay.
'MOTOR' is hidden within the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

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

I've seen this clue in The Mirror.

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