Most drowsy (9)
I believe the answer is:
sleepiest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most drowsy</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 sleepiest that I've seen before include "most lethargic" , "more tired than anyone else" .)