Laws the expert may break (4)

I believe the answer is:

code

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'laws' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for code that I've seen before include "Encryption, disguised language" , "Morse is a good example" , "Secret system of letters. words etc" , "Playfair is one" , "Cryptogram or set of standards" .)

I've seen this clue in The Globe and Mail.

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