Crossword Genius

___ fly (RBI producer) (3)

Ross

I believe the answer is:

sac

(Other definitions for sac that I've seen before include "Bag-like part in animal or plant" , "Membranous cavity" , "Traditional entitlement to hold court" , "Animal or vegetable pouch" , "Pouch or bag-like structure" .)

I've seen this clue in The Wall Street Journal.
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