Ludicrous or grotesque act (5)
I believe the answer is:
antic
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">ludicrous</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">grotesque act</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 antic that I've seen before include "Mad act done for fun" , "Grotesque, fantastic (archaic)" , "Old clown" , "Absurd act" , "Prank" .)