Jack-in-the-pulpit (4)
I believe the answer is:
arum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jack-in-the-pulpit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for arum that I've seen before include "Type of plant, lily perhaps" , "Perennial" , "Plant with small flowers and arrow-shaped leaves - kind of lily" , "Type of 1 Across" , "Plant of the family Araceae, eg lords-and-ladies" .)