Crossword Genius

Boss of a horse breeding business (4)

Ross

I believe the answer is:

stud

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'boss' is the definition.
(both can mean a metal decoration)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stud that I've seen before include "Male pin-up" , "Macho - stables - boss" , "Ornamental protuberance" , "What makes shoe skidproof" , "Macho - stable - boss" .)

I've seen this clue in the Sydney Morning Herald.
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