Giving no rash diagnosis? (8)

I believe the answer is:

spotless

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'giving' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for spotless that I've seen before include "Absolutely pure, clean" , "honest!" , "Without blemish" , "Perfect" , "Above reproach - perfectly clean" .)

I've seen this clue in The Globe and Mail.

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