### Clue: Base evacuated to accommodate Jack in a French extreme jumping sport (6)
### Answer: BUNJEE 
 ### Explanation: Definition: extreme jumping sport
 "Base " **minus its inner letters**(evacuated) **containing**(to accommodate) [ J(abbrev. for "Jack" in a pack of playing cards) **contained in**(in) UNE(French for "a") ].
I can only find "bungee" or "bungy", not "bunjee" in the references (though there could be one out there that I haven't found).