Right after prune entrée upset businessman (12)
I believe the answer is:
entrepreneur
'businessman' is the definition.
(I know that entrepreneur is a type of businessman)
'right after prune entree upset' is the wordplay.
'right' becomes 'r' (abbreviation).
'after' is a charade indicator (letters next to each other).
'upset' indicates an anagram.
'prune'+'entree'='pruneentree'
'pruneentree' anagrammed gives 'entrepreneu'.
'r' put after 'entrepreneu' is 'ENTREPRENEUR'.
(Other definitions for entrepreneur that I've seen before include "Businessman who takes more than average risk" , "Commercial figure" , "impresario" , "business figure" , "Chap running business" .)