Nothing in set for sale is a result of crime (4)
I believe the answer is:
loot
'a result of crime' is the definition.
'nothing in set for sale' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'in' indicates putting letters inside.
'set for sale' becomes 'lot' (auction lot).
'o' going inside 'lot' is 'LOOT'.
'is' acts as a link.
(Other definitions for loot that I've seen before include "Stolen goods" , "Steal (goods); money" , "Steal goods as spoils" , "Steal property (in war)" , "Stolen property" .)