Crossword Genius

Education acronym (4)

Ross

I believe the answer is:

stem

(Other definitions for stem that I've seen before include "Hold back - stock - check" , "Vertical part of flower or drinking glass" , "Slender upright part, of flower or glass" , "Slender upright part, of flower or wineglass" , "supporter of flag, for example" .)

I've seen this clue in the L.A. Times Daily, the LA Times, The New York Times and The Wall Street Journal.
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