Crossword Genius

Occurring rarely (4,2,1,4,4)

Ross

I believe the answer is:

once in a blue moon

(Other definitions for once in a blue moon that I've seen before include "on very rare occasions" , "very rarely" , "Hardly ever (4,2,1,4,4)" , "with extremely low frequency'" , "very occasionally" .)

I've seen this clue in the Sydney Morning Herald.
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