Heavenly arcs (8)

I believe the answer is:

rainbows

(Other definitions for rainbows that I've seen before include "Colourful arcs associated with pots of gold" , "Natural coloured arcs" , "Young Guides" , "Arches of the colours of the spectrum" , "Arcs of colour in the sky" .)

I've seen this clue in the King Feature Syndicate.

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