Innocuous (8)
I believe the answer is:
harmless
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">innocuous</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for harmless that I've seen before include "Completely safe" , "Safe; innocent" , "Not likely to cause damage" , "Not injurious" , "Not producing any toxic effects" .)