Crossword Genius

Rainbow's shape (3)

Ross

I believe the answer is:

arc

'rainbow's 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 "Curve of car" , "Bow" , "Part of curved line" , "Part of a curve" , "Something used to weld" .)

I've seen this clue in the Penny Press, the Newsday, the Universal and the USA Today.
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