Crossword Genius

Smarten up a man on his wedding day (5)

Ross

I believe the answer is:

groom

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for groom that I've seen before include "school" , "Horse carer" , "Man in stable (about to be married?)" , "man of the match" , "Prepare; one getting wed" .)

I've seen this clue in The Globe and Mail and The Irish News.
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