### Clue: Game, unfinished one, about to keep John playing (7)
### Answer: MAHJONG 
 ### Explanation: Definition: Game
 **Reversal of**(…, about) "game"(one, referring to the definition in the clue) **minus**
**its last letter**(unfinished …) **containing**(to keep) **anagram of**(… playing) JOHN.