Doctor, I have motivation (5)

I believe the answer is:

drive

'motivation' is the definition.
(I've seen this before)

'doctor i have' is the wordplay.
'doctor' becomes 'dr' (abbreviation).
'i have' becomes 'ive' (contraction of 'I have').
'dr'+'ive'='DRIVE'

(Other definitions for drive that I've seen before include "Sales campaign - energy - push" , "Motivate" , "Motor < car storage space" , "Propel; outing" , "Urge; approach to house" .)

I've seen this clue in The Telegraph and The Daily Express.

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