Crossword Genius

Violin bow application also called colophony (5)

Ross

I believe the answer is:

rosin

(Other definitions for rosin that I've seen before include "Varnish etc. from turpentine" , "Fiddler's requirement" , "Rub it along the violin bow" , "Violin bow treatment" , "What gives bite to strings" .)

I've seen this clue in The Sunday Times and The Times.
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