Dirty condition? Points out suds no good (9)

I believe the answer is:

dustiness

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'dirty condition?' is the definition.
The definition suggests a singular noun which matches the answer.

'points out suds no good' is the wordplay.
I cannot really see how this works, but
'points' could be 'nes' (NE is an example) and 'nes' is found in the answer.
'no good' could be 'us' (abbreviation for unservicable) and 'us' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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

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