Performed and made a killing (8)
I believe the answer is:
Here is my best explanation:
This clue might be a double definition.
'performed' is the first definition.
(I've seen this before)
'made a killing' is the second definition.
'executed' can be an answer for 'made' (executing is a kind of making). I am not certain of the 'a killing' bit.
'and' is the link.
(Other definitions for executed that I've seen before include "Put a plan into effect", "Produced", "Performed", "Put to death as punishment", "Beheaded", "Did", "Carried out the task or put to death", "Lawfully killed" and "Done (to death?)".)