One's motor on fire perhaps (6)

I believe the answer is:

engine

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

'one's motor' is the definition.
'engine' can be an answer for 'motor' (engine is a kind of motor). I am not sure about the 'one's' bit.

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

Can you help me to learn more?

(Other definitions for engine that I've seen before include "Power unit" , "Machine supplying power" , "eg Nine (anag.)" , "Locomotive" , "search, maybe" .)

I've seen this clue in The Globe and Mail.

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