Mystery's dim arrangement showing lack of balance (11)

I believe the answer is:

dissymmetry

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'lack of balance' is the definition.
The definition suggests a singular noun which matches the answer.

'mystery's dim arrangement' is the wordplay.
'arrangement' indicates anagramming the letters.
'mysterys'+'dim'='mysterysdim'
'mysterysdim' with letters rearranged gives 'DISSYMMETRY'.

'showing' acts as a link.

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I've seen this clue in The Irish Independent.

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