With 46-Across, colorful rhyme for a 1966 Donovan hit (6)

I believe the answer is:

mellow

(Other definitions for mellow that I've seen before include "Made kindly and understanding by age" , "Relaxed, genial" , "Relaxed but slightly drunk" , "Calm and relaxed" , "Ripened by experience etc" .)

I've seen this clue in The New York Times.

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