Card expert (3)
I believe the answer is:
ace
I believe this is a double definition.
'card' is the first definition.
(ace is a kind of card)
'expert' is the second definition.
(ace is a kind of expert)
(Other definitions for ace that I've seen before include "In golf, a hole in one" , "'wicked'!" , "Possibly a diamond" , "reason for point of no return" , "Crack" .)