Large palm seed (7)
I believe the answer is:
coconut
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large palm seed</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 coconut that I've seen before include "Hard thing" , "Hard-shelled fruit of palm tree with white lining" , "cut from the palm?" , "Large edible fruit" , "Large palm fruit" .)