Crossword Genius

Coloured arc in the sky (7)

Ross

I believe the answer is:

rainbow

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

(Other definitions for rainbow that I've seen before include "Arc caused by refraction of the sun's rays (7" , "colours in the sky" , "illusory hope?" , "Arc of colours" , "Multicoloured atmospheric phenomenon" .)

I've seen this clue in The Guardian, The Independent, The Telegraph and The Mirror.
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