Crossword Genius

Once, once (4)

Ross

I believe the answer is:

erst

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

This is all the clue.

(Other definitions for erst that I've seen before include "in the past" , "in former times" , "Rest turned formerly" , "At first; formerly" .)

I've seen this clue in the Penny Press, The New York Times, the King Feature Syndicate and The Wall Street Journal.
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