It's kept in Delaware, but broken in Wales (3)

I believe the answer is:

law

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'broken in wales' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'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 "Set of rules laid down by authority" , "Regulation" , "Rule of conduct" , "at 16 down [MAN UNITED]" , "Collection of rules for a society" .)

I've seen this clue in the Evening Standard.

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