Tidying mess shows propriety (7)

I believe the answer is:

dignity

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'propriety' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for dignity that I've seen before include "Sense of self-pride" , "Self-respect" , "Calm and serious manner" , "Sense of self-importance" , "Bearing deserving respect" .)

I've seen this clue in The Sun.

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