A lean cop busted a notorious gangster (2,6)
I believe the answer is:
al capone
'a notorious gangster' is the definition.
'Al Capone' can be an answer for 'gangster' (US gangster). I am unsure of the 'a notorious' bit.
'a lean cop busted' is the wordplay.
'busted' indicates an anagram.
'lean'+'cop'='leancop'
'leancop' anagrammed gives 'lcapone'.
'a'+'lcapone'='AL CAPONE'
Can you help me to learn more?
(Other definitions for al capone that I've seen before include "Notorious Chicago gangster called Scarface" , "Chicago gangster known as Scarface" , "criminal" , "US gangster in Chicago, arrested for tax evasion" , "Notorious gangster, d. 1947" .)