Nut cracked for old man (6)
I believe the answer is:
almond
'nut' is the definition.
(almond is a type of nut)
'cracked for old man' is the wordplay.
'old man' anagrams to 'ALMOND'.
However, I am unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for almond that I've seen before include "Nut which provides cake icing" , "Old man with nice nut" , "Nut often used in cake icing (6)." , "Edible nut" , "Oval-shaped nut" .)