Crossword Genius

Fruit upset old man (6)

Ross

I believe the answer is:

almond

'fruit' is the definition.
(almond is a kind of fruit)

'upset old man' is the wordplay.
'upset' is an anagram indicator.
'old'+'man'='oldman'
'oldman' with letters rearranged gives 'ALMOND'.

(Other definitions for almond that I've seen before include "Nut used in marzipan" , "Kind of nut, makes nice icing on cake" , "Nut which provides cake icing" , "Old man with nice nut" , "Nut often used in cake icing (6)." .)

I've seen this clue in The Telegraph.
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