Crossword Genius

At some earlier time (4)

Ross

I believe the answer is:

once

'at some earlier time' 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 bygone days" , "Formerly; as soon as" , "One-time - one time" , "yesterday" , "Singly" .)

I've seen this clue in The Wall Street Journal and the LA Times.
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