Make troubled (7)
I believe the answer is:
agitate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make troubled</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for agitate that I've seen before include "Perturb" , "Get upset" , "'Stir, excite (7)'" , "Stir violently" , "Stir up (trouble?)" .)