Slumbered (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slumbered</span>' is the definition.<br/ ><span class="explanation-format__explanation">('sleep' can be a synonym of 'slumber')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for slept that I've seen before include "Napped, dozed" , "Had room for" , "Was dormant" , "Snoozed" , "appeared still" .)
(Another definition for dozed that I've seen is " Slept lightly".)