Graduate gets double sodium from fruit (6)
I believe the answer is:
banana
'fruit' is the definition.
(type of fruit)
'graduate gets double sodium' is the wordplay.
'graduate' becomes 'ba' (someone with a Bachelor of Arts degree).
'gets' is a charade indicator (letters next to each other).
'double' indicates the doubling of some letters.
'sodium' becomes 'NA' (Na is the chemical symbol for sodium).
'na' duplicated is 'nana'.
'ba'+'nana'='BANANA'
'from' acts as a link.
(Other definitions for banana that I've seen before include "Elongated edible fruit" , "Plantain-like fruit" , "Comedians slip on its skin" , "Long curved fruit" , "Yellow fruit with slippery skin" .)