Drivel, gibberish (8)
I believe the answer is:
nonsense
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">drivel</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that nonsense is a type of drivel)</span><br/ ><br/ >'<span class="explanation-format__original">gibberish</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that gibberish can be written as nonsense)</span><br/ ><br/ ></span>
(Other definitions for nonsense that I've seen before include "'Foolishness, silliness (8)'" , "Quick look" , "Rubbish, foolish talk" , "Rubbish, twaddle" , "one [TOMMYROT], thirteen [CODSWALLOP], or twenty [BALDERDASH]" .)