Effervescence (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">effervescence</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fizz that I've seen before include "Bubbles in champagne?" , "Hissing sound; champagne" , "Effervesce" , "Froth" , "Gas in drink" .)
(Another definition for spritzig that I've seen is " sparkling wine".)