Prepare a person for a stable job (5)

I believe the answer is:

groom

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'prepare' is the definition.
(eg grooming someone for a job)

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

(Other definitions for groom that I've seen before include "Educate for a future role" , "Man in stable (about to be married?)" , "One caring for horses" , "royal attendant" , "Stable attendant" .)

I've seen this clue in the Evening Standard.

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