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Dalmatians unlikely to be this pure (8)

Ross

I believe the answer is:

spotless

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'this pure' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for spotless that I've seen before include "Spic-and-span" , "Without a mark, completely clean" , "Extremely clean" , "Fully clean" , "Immaculate" .)

I've seen this clue in The Sun.
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