Riches produced by breaking the law (6)
I believe the answer is:
wealth
'riches' is the definition.
('wealth' can be a synonym of 'riches')
'breaking the law' is the wordplay.
'breaking' is an anagram indicator.
'the'+'law'='thelaw'
'thelaw' anagrammed gives 'WEALTH'.
'produced by' acts as a link.
(Other definitions for wealth that I've seen before include "Possessions and resources" , "'Riches, affluence (6)'" , "Mammon" , "Riches, worldly goods" , "Material worth" .)