It's usually kept in Delaware (3)

I believe the answer is:

law

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'it's usually kept' is the definition.
I can't tell whether this definition defines the answer.

'in delaware' is the wordplay.
'in' says the answer is hidden in the clue.
'LAW' can be found hidden inside 'delaware'.

Can you help me to learn more?

(Other definitions for law that I've seen before include "Body of rules of conduct for a society" , "at 16 down [MAN UNITED]" , "Rule imposed by authority" , "Edict" , "'Possession is nine points of the ...'" .)

I've seen this clue in the Evening Standard.

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