Syringa (5)
I believe the answer is:
lilac
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">syringa</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lilac that I've seen before include "garden ornamental" , "Pinkish purple - shrub" , "Tree with purple or white flowers" , "Flowering tree of the olive family" , "Shade" .)