Doesn't go to bed (5,2)
I believe the answer is:
stays up
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">doesn't go to bed</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 stays up that I've seen before include "doesn't settle in the evening" , "remains air-bound!" .)