Plant grown for seeds (6)
I believe the answer is:
sesame
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">plant grown for seeds</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 sesame that I've seen before include "Plant grown for its seeds" , "Plant with oil-rich seeds" , "Seed or oil used in cooking" , "which magically opens" , "Small oval seeds yielding an edible oil" .)