Resin obtained from a tree of NW Africa whose hard dark wood is used for decorative work (8)
I believe the answer is:
sandarac
(Other definitions for sandarac that I've seen before include "resin for varnishing" , "Resin used in varnish" , "Cypress gum resin; as canard (anag.)" .)
I've seen this clue in The Mirror.
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