Shame: duo might be causing chaos (8)

I believe the answer is:

madhouse

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'chaos' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'shame duo might be' is the wordplay.
'might be' indicates an anagram.
'shame'+'duo'='shameduo'
'shameduo' with letters rearranged gives 'MADHOUSE'.

'causing' acts as a link.

Can you help me to learn more?

(Other definitions for madhouse that I've seen before include "state of chaos" , "pandemonium?" , "badly run establishment?" , "asylum" , "9d 21d [BEDLAM]" .)

I've seen this clue in The Sun.

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