Crossword Genius

What might accompany a baseball card (3)

Ross

I believe the answer is:

gum

(Other definitions for gum that I've seen before include "Adhesive for chewing" , "Sticky stuff - tree" , "Gingeva is its technical name" , "A chopper base" , "surrounding roots of teeth?" .)

I've seen this clue in The New York Times.
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