Common tuber (6)
I believe the answer is:
potato
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">common tuber</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for potato that I've seen before include "Plant tuber eaten as a vegetable" , "Maris Piper?" , "Vegetable with eyes" , "Edible tuber; hole in stocking (colloq.)" , "Food item (with eyes?)" .)