Billionaire philanthropist is procuring fleshy fruit (7)
I believe the answer is:
sorosis
'fleshy fruit' is the definition.
The definition suggests a singular noun which matches the answer.
'billionaire philanthropist is' is the wordplay.
'billionaire philanthropist' becomes 'soros' (I am not sure about this - if you are sure you should believe this answer much more).
'soros'+'is'='SOROSIS'
'procuring' is the link.
Can you help me to learn more?
(Another definition for sorosis that I've seen is " fruit like the pineapple".)