Crossword Genius

At some time in the past (4)

Ross

I believe the answer is:

once

'at some time in the past' 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 "In days gone by" , "A single time" , "yesterday" , "Quick examination" , "At some time past" .)

I've seen this clue in The Times.
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