Highly elated (7,2,3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">highly elated</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 walking on air that I've seen before include "Highly elated" , "In seventh heaven" , "Extremely happy" .)