Nuts used to make marzipan (7)
I believe the answer is:
almonds
'nuts used to make marzipan' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for almonds that I've seen before include "Sold man on kind of nuts" , "Fruits for marzipan" , "Man sold (anag.)" , "Nuts used to make marzipan" .)