Be half asleep (6)
I believe the answer is:
drowse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be half asleep</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 drowse that I've seen before include "Doze, be half asleep" , "Snooze" , "Nod" , "Feel dozy" , "feel sleepy" .)