Crossword Genius

Mustard, for one: Abbr (3)

Ross

I believe the answer is:

col

(Other definitions for col that I've seen before include "A pass between mountain peaks" , "Depression among ecologists" , "route through mountains" , "Mountain defile" , "Mustard" .)

I've seen this clue in the L.A. Times Daily and the New York Times.
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