Brooding (6)
I believe the answer is:
moping
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brooding</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 moping that I've seen before include "brooding" , "Sulking or mooning about" , "Wandering about in low spirits" , "Moving about listlessly" , "Being dejected and apathetic" .)