Crossword Genius

Boss showing diligence discharging debts (4)

Ross

I believe the answer is:

stud

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for stud that I've seen before include "Boss; shirt fastener" , "Horse-breeding place" , "Collar-fastener" , "Ladies' man?" , "Collar fastener - form of poker" .)

I've seen this clue in The Times.
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