Mirth, merrymaking (6)
I believe the answer is:
gaiety
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">mirth</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">merrymaking</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for gaiety that I've seen before include "High spirits" , "Cheerfulness - merrymaking" , "Merriment, festive feeling" , "Light-hearted state" , "Merriment on Dublin's Sth King Street" .)