Sleep-inducing (9)
I believe the answer is:
soporific
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sleep-inducing</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for soporific that I've seen before include "Sleep-inducing" , "Causing sleepiness" , "making one nod" , "Inducing drowsiness or sleep" , "Inducing mental lethargy" .)