Feeling of great elation (8)
I believe the answer is:
euphoria
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">feeling of great elation</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 euphoria that I've seen before include "Sense of wellbeing" , "Irrational high" , "Blissful state" , "Feeling of great elation and joy" , "Intense feeling of well-being and elation." .)