Crossword Genius

Spooner's turning instrument into closing material (7,3)

Ross

I believe the answer is:

sealing wax

(Other definitions for sealing wax that I've seen before include "It is heated and dripped onto documents" , "cabbages next, of many things to discuss" , "I used to stamp letter" , "resinous substance" , "It's given the impression" .)

I've seen this clue in The Guardian.
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