Make bubbly (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make bubbly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(aerate can mean to make something bubbly)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for aerate that I've seen before include "Pass bubbles through?" , "Ventilate" , "Pass gas through" , "Let in oxygen" , "Fill with oxygen" .)