Song by Gerry Goffin and Carole King which was a 1963 hit for the Chiffons (3,4,3)

I believe the answer is:

one fine day

(Other definitions for one fine day that I've seen before include "Dreadful English summer" , "noted by Puccini?" , "Terrible summer" , "'Madame Butterfly' aria" .)

I've seen this clue in The Independent.

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