Resin used to make varnish (7)

I believe the answer is:

shellac

(Other definitions for shellac that I've seen before include "Resin used in varnishes" , "Varnish ingredient" , "Varnish derived from insect secretion" , "Resin used for varnish, formerly for records" , "Sort of resin" .)

I've seen this clue in The Guardian.

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