Like a heart or diamond (3)

I believe the answer is:

red

(Other definitions for red that I've seen before include "River, its source in the US, flowing north to empty into L Winnipeg" , "Scarlet or vermilion" , "Colour of garnets" , "- - poker: Kniphofia" , "Merchant flag" .)

I've seen this clue in The Wall Street Journal.

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