Crossword Genius

Polychromatic arc (7)

Ross

I believe the answer is:

rainbow

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">polychromatic arc</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Guardian and The Sun.
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