Shame: duo might be causing chaos (8)
I believe the answer is:
madhouse
'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]" .)