Edible starchy root (7)
I believe the answer is:
cassava
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">edible starchy root</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 cassava that I've seen before include "tree" , "Plant yielding starch" , "Root crop of the tropics" , "Edible starchy root" , "starchy type" .)