Crossword Genius

Sticky tree secretion (5)

Ross

I believe the answer is:

resin

(Other definitions for resin that I've seen before include "Sap product" , "Organic polymer used in varnishes, adhesives etc." , "Substance from tree-sap" , "Origin of amber" , "Sticky tree exudation" .)

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