New chart design is a difficult task (7,4)

I believe the answer is:

herding cats

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'a difficult task' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'new chart design' is the wordplay.
'new' is an anagram indicator.
'chart'+'design'='chartdesign'
'chartdesign' is an anagram of 'HERDING CATS'.

'is' is the link.

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I've seen this clue in the Sydney Morning Herald.

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