Substance exuded by various acacia trees used in the manufacture of adhesives (3,6)

I believe the answer is:

gum arabic

(Other definitions for gum arabic that I've seen before include "Substance exuded by acacia" , "glue" , "Exudation used in glues and incense" , "Ingredient of 16 across" .)

I've seen this clue in The Mirror.

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