Slimly (9)
I believe the answer is:
slenderly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slimly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for slenderly that I've seen before include "in inadequate way" , "Slightly" , "In a gracefully thin manner" .)