Crossword Genius

Substance used by gymnasts and cellists (5)

Ross

I believe the answer is:

rosin

(Other definitions for rosin that I've seen before include "Wax for violin bow etc." , "It's used on a violin bow" , "Sticky stuff rubbed on violin strings" , "No sir; it is rubbed on violin bows" , "Varnish etc. from turpentine" .)

I've seen this clue in The New York Times.
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