Crossword Genius

What can fasten a breeding stable? (4)

Ross

I believe the answer is:

stud

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'breeding stable?' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for stud that I've seen before include "Ornamental protuberance" , "Press fastener" , "Fastening for collar" , "Knob; fastener; boss" , "Gripper under a boot" .)

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