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Set-up that's not working on Souness? Yes, it seems, periodically (9)

Ross

I believe the answer is:

nonsystem

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'set-up that's not working' is the definition.
I know nothing about this answer so I can't judge whether this works.

'on souness? yes it seems periodically' is the wordplay.
'periodically' means one should take alternating letters (letters must be selected 'every so often').
'on'+'souness'+'yes'+'it'+'seems'='onsounessyesitseems'
The alternate letters of 'onsounessyesitseems' are 'NONSYSTEM'.

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