Clean and free from measles? (8)
I believe the answer is:
spotless
'clean' is the definition.
(similar in meaning)
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 "showing no sign of acne?" , "How Lady Macbeth wanted to be" , "Perfect" , "Immaculately clean" , "honest!" .)