Rundown feeling (7)
I believe the answer is:
fatigue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rundown feeling</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fatigue that I've seen before include "weary" , "Chronic symptom" , "listlessness" , "military chore" , "military punishment" .)