Hardly a faultless game (6)
I believe the answer is:
tennis
'game' is the definition.
(tennis is a game)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tennis that I've seen before include "Racquet-game" , "Roger Federer's game - anyone for it?" , "event" , "Evil trap set up for game" , "Wimbledon game" .)