Brilliant as one at cards? (3)
I believe the answer is:
ace
I believe this is a triple definition!
'brilliant' is the first definition.
(ace can informally mean very good)
'as' acts as a link.
'one' is the second definition.
(ace has a value of one in some card games)
'at' acts as a link.
'cards?' is the third definition.
(thesaurus)
(Other definitions for ace that I've seen before include "Entertain" , "star" , "unit > of highest quality" , "Player who excels" , "Playing card with single spot" .)