Crossword Genius

At one time, at one time (4)

Ross

I believe the answer is:

erst

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">at one time at one time</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

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

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