Crossword Genius

___ G. Biv (rainbow mnemonic) (3)

Ross

I believe the answer is:

roy

(Other definitions for roy that I've seen before include "- Orbison, US singer" , "Rob .... was a famous Scottish bandit" , "Rob . . . was a notorious Scottish outlaw" , "Man" , "'... Rogers, old film star cowboy (3)'" .)

I've seen this clue in the Universal and the USA Today.
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