Crossword Genius

It appears on 78% of all national flags (3)

Ross

I believe the answer is:

red

(Other definitions for red that I've seen before include "A colourful communist" , "- - poker: Kniphofia" , "Colour of Merlot wine" , "The colour of the former Russian army" , "- Cross; - carpet" .)

I've seen this clue in The New York Times.
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