Crossword Genius

Some time ago (4)

Ross

I believe the answer is:

once

'some time ago' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for once that I've seen before include "Formerly; as soon as" , "in days of yore?" , "On one occasion" , "Formerly - not repeated" , "Just as a single occurrence" .)

I've seen this clue in the USA Today, The New York Times, the LA Times, the Universal and the Penny Press.
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