Crossword Genius

Ne plus ultra (4)

Ross

I think it could be either:

acme

apex

'ne plus ultra' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for acme that I've seen before include "High point of excellence" , "highest position" , "crisis in history" , "crown" , "Highest stage of development" .)

I've seen this clue in The New York Times.
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