"___ (Da Ba Dee)" (colorfully titled hit song by Eiffel 65) (4)

I believe the answer is:

blue

(Other definitions for blue that I've seen before include "Azure" , "Oxbridge sports award" , "Miserable; waste (money)" , "This could be royal or navy" , "Glum, sad" .)

I've seen this clue in The Washington Post.

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