Lively vivacious quality (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
esprit
(Other definitions for esprit that I've seen before include "Sprightliness" , "Sparkling quality" , "Liveliness of wit" , "Group morale is . . . . . . de corps" , "French morale as in de corps?" .)