### Clue: What may restore fount of knowledge from King's, after playing with some appropriate language (7)
### Answer: GINSENG 
 ### Explanation: Definition: What may restore
 **Anagram of**(after playing) [ "King's" **minus**(from …) **1st letter of**(fount of) "knowledge " ] **plus**(with) ENG(abbrev. for the English language).