Give emphasis to (9)
I believe the answer is:
highlight
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">give emphasis to</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for highlight that I've seen before include "Climax" , "Outstanding feature" , "Emphasize" , "Draw attention to - streak in hair" , "Best item of event" .)