Vivacious quality (6)
I believe the answer is:
esprit
'vivacious quality' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for esprit that I've seen before include "French morale as in de corps?" , "Stripe (anag)" , "Liveliness - priest (anag)" , "wit from France" , "What good corps needs" .)