Crossword Genius

Sine __ non: essential (3)

Ross

I believe the answer is:

qua

(Other definitions for qua that I've seen before include "In the capacity of (Latin)" , "Sine - non is an indispensable condition" , "Wharf, dock." .)

I've seen this clue in the LA Times, the L.A. Times Daily and The Washington Post.
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