Touched on something touchy (3,1,5)
I believe the answer is:
hit a nerve
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">touched on something touchy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hit a nerve that I've seen before include "Referred to a sensitive topic" , "Get a reaction by raising a sensitive issue" .)