Nut of the genus Prunus (6)

I believe the answer is:

almond

(Other definitions for almond that I've seen before include "Kind of nut, makes nice icing on cake" , "Old man (anag)" , "Nut which provides cake icing" , "Nut (tree)" , "Marzipan-producing nut" .)

I've seen this clue in The Guardian.

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