It's kept in Delaware, but broken in Wall Street (3)
I believe the answer is:
law
'broken in wall street' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'it's kept in delaware but' is the wordplay.
'it's kept in' indicates the answer is hidden within the clue.
'LAW' is hidden within 'delaware but'.
Can you help me to learn more?
(Other definitions for law that I've seen before include "Rule prohibiting certain actions" , "Official rule" , "Rule imposed by authority" , "Regulation" , "Edict" .)