Crossword Genius

Material used to string bows for musical instruments (9)

Ross

I believe the answer is:

horsehair

(Other definitions for horsehair that I've seen before include "Mane or tail fibres" , "substance, stranded" , "material for stuffing" , "Good stuffing" , "It's used in furniture for padding" .)

I've seen this clue in The Times.
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