Last of victims leaving corrupt control freak (8)
I believe the answer is:
svengali
'control freak' is the definition.
(I've seen this before)
'last of victims leaving corrupt' is the wordplay.
'last of' indicates one should take the final letters.
'corrupt' is an anagram indicator (a corrupted form).
The last letter of 'victims' is 's'.
'leaving' with letters rearranged gives 'vengali'.
's'+'vengali'='SVENGALI'
(Other definitions for svengali that I've seen before include "Manipulative person" , "dominating influence" , "man of influence" , "someone having 5 [INFLUENCED] victims?" , "Complete controller" .)