Thanksgiving tuber (3)
I believe the answer is:
yam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thanksgiving tuber</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 yam that I've seen before include "May be a sweet potato" , "vegetable plant" , "Potato-like vegetable" , "A starchy tuber" , "May be a sweet spud" .)