Horse maybe born to give a cowboy a start? (6)

I believe the answer is:

bronco

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'horse' is the definition.
(bronco is a kind of horse)

I don't understand the remainder of the clue.

(Other definitions for bronco that I've seen before include "Untamed mustang" , "Wild bucking horse" , "Wild horse of the western US" , "Half-tamed horse used in rodeos" , "Untamed horse (US)" .)

I've seen this clue in the Evening Standard.

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