Crossword Genius

Acronym to which an "A" is sometimes added (4)

Ross

I believe the answer is:

stem

(Other definitions for stem that I've seen before include "Basic skiing turn" , "Hold back - stock - check" , "Staunch - support" , "Main central part as of plant or glass" , "Ski turn and plant stalk" .)

I've seen this clue in the LA Times.
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