Crossword Genius

Boss in reproduction business? (4)

Ross

I believe the answer is:

stud

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

I cannot understand how the remainder of the clue works.

(Other definitions for stud that I've seen before include "Large headed nail" , "Macho - stables - boss" , "Collar fastener - form of poker" , "Specified arrangement" , "Animal kept for breeding" .)

I've seen this clue in The Times.
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