Crossword Genius

Polychromatic arc (7)

Ross

I believe the answer is:

rainbow

'polychromatic arc' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for rainbow that I've seen before include "Arc of colour in the sky" , "Multi-coloured arc in the sky" , "Colourful display" , "Natural arch of colours" , "Spectrum in the sky" .)

I've seen this clue in The Sun and The Guardian.
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