Tropical root vegetable (4)
I believe the answer is:
taro
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tropical root vegetable</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 taro that I've seen before include "Root to eat" , "Starchy plant" , "Starchy food" , "Chinese eddo" , "A rot turns the lily-like plant" .)