Suffering from insomnia (9)
I believe the answer is:
sleepless
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">suffering from insomnia</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 sleepless that I've seen before include "Suffering from insomnia, not in the land of Nod" , "Insomniac" , "Film: '-- in Seattle'" .)