Person managing excellent American stud (4)
I believe the answer is:
boss
I believe this is a quadruple definition!!
'person managing' is the first definition.
(I've seen this before)
'excellent' is the second definition.
(thesaurus)
'american' is the third definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'stud' is the fourth definition.
(synonyms)
Can you help me to learn more?
(Other definitions for boss that I've seen before include "Informal employer or superior" , "Team manager" , "Take charge of" , "Master - stud" , "Behave overbearingly" .)