Not sleeping (5)
I believe the answer is:
awake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not sleeping</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 awake that I've seen before include "On the ball?" , "Unable to sleep" , "Completely conscious" , "Make active again" , "Conscious and (usually) open-eyed" .)