Crossword Genius

Imperfect release (4)

Ross

I believe the answer is:

beta

(Other definitions for beta that I've seen before include "character in Marathon" , "Greek letter -- second in order of importance" , "Second letter of the Greek alphabet" , "Character between alpha and gamma" , "In a constellation, a star second in brightness" .)

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