Crossword Genius

Historically (4)

Ross

I believe the answer is:

once

'historically' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for once that I've seen before include "In the old days" , "Previously" , "At some time past" , "Formerly - not repeated" , "yesterday" .)

I've seen this clue in The New York Times and the Newsday.
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