Breaking the law, get riches (6)
I believe the answer is:
wealth
'riches' is the definition.
(synonyms)
'breaking the law' is the wordplay.
'breaking' indicates anagramming the letters.
'the'+'law'='thelaw'
'thelaw' anagrammed gives 'WEALTH'.
'get' is the link.
(Other definitions for wealth that I've seen before include "capital" , "was common under Cromwell" , "Assets" , "State of luxury" , "Abundance of resources" .)