Nut used to make marzipan (6)
I believe the answer is:
almond
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nut used to make marzipan</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 almond that I've seen before include "Nut-like kernel" , "Type of nut" , "Nut which provides cake icing" , "Nut (tree)" , "Nutlike seed" .)