Breeding farm boss (4)

I believe the answer is:

stud

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This might be a double definition.

'breeding farm' is the first definition.
'stud' can be an answer for 'farm' (stud farm is a kind of farm). I am unsure of the 'breeding' bit.

'boss' is the second definition.
(synonyms)

Can you help me to learn more?

(Other definitions for stud that I've seen before include "Knob; fastener; boss" , "seen in a boiled shirt" , "Randy young male" , "Collar fastener or horse farm" , "Horse-breeding place" .)

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

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