Crossword Genius

Grocery checkout staple (3)

Ross

I believe the answer is:

gum

(Other definitions for gum that I've seen before include "Glue; jelly-like sweet" , "Adhesive - eucalyptus" , "Adhesive for chewing" , "Sticky plant substance" , "Prepartion for sticking or chewing" .)

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