Ambition (5)

I believe the answer is:

drive

'ambition' is the definition.
(I know that ambition can be written as drive)

This is the entire clue.

(Other definitions for drive that I've seen before include "gear" , "tenacity" , "Impetus; take car" , "Urge; approach to house" , "Control and steer vehicle" .)

I've seen this clue in The Wall Street Journal, the USA Today, the Evening Standard, The Mirror, the Penny Press and the King Feature Syndicate.

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