Fizziness (13)
I believe the answer is:
effervescence
'fizziness' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for effervescence that I've seen before include "Bubbling - vivacity" , "Sparkle" , "Frothy bubbles" , "Fizziness; vivacity" , "Frothiness" .)