Crossword Genius

Pin-up or pin down? (4)

Ross

I believe the answer is:

stud

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

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 "Part of a football boot" , "A horse breeding farm" , "Stallion for breeding - fastener" , "Style of poker" , "Horse-breeding farm" .)

I've seen this clue in The Guardian.
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