Dimness but nicely sun-kissed (9)

I believe the answer is:

duskiness

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'dimness' is the definition.
(I know that dimness can be written as duskiness)

'nicely sun-kissed' is the wordplay.
'sun-kissed' anagrams to 'DUSKINESS'.
Though, I'm not clear how the anagram is indicated.

'but' acts as a link.

Can you help me to learn more?

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

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