Rich and tough criminal cases heard here (4,5)
I believe the answer is:
high court
'cases heard here' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'rich and tough criminal' is the wordplay.
'and' says to put letters next to each other.
'criminal' indicates an anagram.
'rich' put after 'tough' is 'toughrich'.
'toughrich' is an anagram of 'HIGH COURT'.
Can you help me to learn more?
(Another definition for high court that I've seen is " Chancery Division is part of this".)