Theres no advantage in having this card (5)
I believe the answer is:
deuce
'this card' is the definition.
(deuce is a kind of card)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for deuce that I've seen before include "Two in cards or dice" , "with equal score" , "Level of tennis" , "score at Wimbledon?" , "Forty all in tennis" .)