Gibberish, nonsense (5,5)
I believe the answer is:
mumbo jumbo
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">gibberish</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that mumbo jumbo is a type of gibberish)</span><br/ ><br/ >'<span class="explanation-format__original">nonsense</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that mumbo jumbo is a type of gibber)</span><br/ ><br/ ></span>
(Other definitions for mumbo jumbo that I've seen before include "Ritual intercourse" , "obscure language" , "Gobbledegook" , "Mysterious speech" , "Claptrap" .)