Crossword Genius

Old gramophone material (7)

Ross

I believe the answer is:

shellac

(Other definitions for shellac that I've seen before include "Thin varnish used to finish wood" , "Material of pre-vinyl 78 rpm records" , "Varnish derived from insect secretion" , "(it's in old records)" , "coat" .)

I've seen this clue in The Guardian.
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