Curses businessman who's contracted charges (9)
I believe the answer is:
execrates
'curses' is the definition.
(I've seen this before)
'businessman who's contracted charges' is the wordplay.
'businessman who's contracted' becomes 'exec' (abbreviation for executive).
'charges' becomes 'rates' (rate is a kind of charge).
'exec'+'rates'='EXECRATES'
(Other definitions for execrates that I've seen before include "Hates" , "Curses" .)