Not asleep (5)
I believe the answer is:
awake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not asleep</span>' is the definition.<br/ ><span class="explanation-format__explanation">('awake' is the opposite to 'asleep')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for awake that I've seen before include "Conscious, aware" , "Patriotic song 'The West's .....'" , "Tossing and turning" , "Unable to sleep" , "Cease sleeping" .)