There may be rhyme if not reason in such justice (6)

I believe the answer is:

poetic

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'justice' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for poetic that I've seen before include "Clearly expressed in speech/writing" , "Like a 16" , "rhythmical" , "Imaginative; like verse" , "One sort of licence" .)

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

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