Large water lily (5)
I believe the answer is:
lotus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large water lily</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lotus that I've seen before include "Sacred Egyptian water lily" , "Plant that mythically induces languor" , "Mythical plant inducing languor" , "Type of water lily" , "Fruit of forgetfulness - water lily - car marque" .)