A real sport (6)
I believe the answer is:
tennis
This could be a double definition.
'a real' is the first definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'sport' is the second definition.
(tennis is a sport)
Can you help me to learn more?
(Other definitions for tennis that I've seen before include "Net sport" , "Game played with racket and ball" , "Game played on court" , "Game (where love is nought?)" , "Racket-and-ball game" .)