Crossword Genius

___ in a blue moon (4)


I believe the answer is:

(Other definitions for once that I've seen before include "One-time musical film and song" , "In the old days" , "At a previous time" , "in bygone days" , "Formerly - not repeated" .)

I've seen this clue in The Mirror, the Newsday, the USA Today and the LA Times.
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