Very happy or merry (6)
I believe the answer is:
joyous
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">very happy</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">merry</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for joyous that I've seen before include "Happy; festive" , "Full of happiness" , "Merry" , "Enraptured" , "Elated" .)