Make sorrowful (6)
I believe the answer is:
sadden
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make sorrowful</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 sadden that I've seen before include "Make mournful" , "get down" , "Dismay" , "Cause to feel unhappy" , "Make dejected" .)