I dig condo notion if well kept (2,4,9)

I believe the answer is:

in good condition

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'i dig' is the definition.
The definition suggests a singular noun which matches the answer.

'condo notion if well kept' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'condo' is 'odcon' which is present in the answer.
This explanation may well be incorrect...

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

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