Idyllically calm and peaceful — kingfisher (7)

I believe the answer is:

halcyon

(Other definitions for halcyon that I've seen before include "Of a period, happy and peaceful - say youth" , "Prosperous" , "Calm and happy - kingfisher" , "Happy and carefree" , "Poetic name for kingfisher" .)

I've seen this clue in The Guardian.

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