Slumber (5)
I believe the answer is:
sleep
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slumber</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that slumber can be written as sleep)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sleep that I've seen before include "crash" , "''... that knits up the ravell'd sleeve of care'' (Macbeth)" , "Doze, nap" , "Natural state of unconscious rest" , "Be dormant" .)