Crossword Genius

"____ upon a time..." (4)

Ross

I believe the answer is:

(Other definitions for once that I've seen before include "Formerly; as soon as" , "... upon a time for the storyteller" , "Formerly - not repeated" , "At some time past" , "in bygone era" .)

I've seen this clue in the USA Today, The Star Tribune, The Mirror and the Universal.
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