Helianthus (9)
I believe the answer is:
sunflower
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">helianthus</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sunflower that I've seen before include "Large golden bloom" , "that Van Gogh used to paint" , "Plant's" , "Source of oil" , "Tall plant" .)