Crossword Genius

Rainbow shape (3)

Ross

I believe the answer is:

'rainbow shape' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for arc that I've seen before include "cut off from the circle" , "Car (anag.)" , "less than the complete circuit" , "Part of curved line" , "Semi-circle" .)

I've seen this clue in The New York Times, the Penny Press, the Universal, the USA Today, the LA Times, the King Feature Syndicate, the Newsday and The Star Tribune.
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