Soothing song (7)
I believe the answer is:
lullaby
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">soothing song</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lullaby that I've seen before include "Soothing song for child" , "soothe" , "Sleep-inducing song" , "Gentle song to put baby to sleep" , "Song to send one to sleep" .)