Edible starch (4)
I believe the answer is:
sago
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">edible starch</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 sago that I've seen before include "Starchy pudding cereal" , "Cereal, used in pudding" , "Powdery starch used in cooking" , "Powdery starch from a palm" , "Edible powdery starch" .)