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___ in a blue moon (4)

Ross

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 USA Today, The Mirror, the LA Times, the Newsday and the Universal.
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