The poker player's boss? (4)

I believe the answer is:

stud

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This clue might be a double definition.

'the poker' is the first definition.
(stud is a kind of poker)

'player's boss?' is the second definition.
'stud' can be an answer for 'boss?' (both can mean a metal decoration). I am not certain of the 'player's' bit.

Can you help me to learn more?

(Other definitions for stud that I've seen before include "Removable collar button" , "Male pin-up" , "who believes he can keep it up" , "equine establishment" , "Item designed to grip" .)

I've seen this clue in The Irish Independent.

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