Home office mostly for boss (4)

I believe the answer is:

stud

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stud that I've seen before include "Farm for breeding horses" , "Gripper under a boot" , "Boss; item of jewellery" , "Macho - stable - boss" , "Variety of poker" .)

I've seen this clue in The Times.

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