Easily irritated or annoyed (6)
I believe the answer is:
tetchy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">easily irritated or annoyed</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 tetchy that I've seen before include "Cantankerous" , "Touchy" , "Ratty" , "Irritable, cross" , "Easily irritated or annoyed, narky" .)