Engine reassigned to aromatic crop (9,5)

I believe the answer is:

capacitor motor

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

'engine' is the definition.
(thesaurus)

'reassigned to aromatic crop' is the wordplay.
I cannot really see how this works, but
'to' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Daily Express.

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