Crossword Genius

Racquet strings (6)

Ross

I believe the answer is:

catgut

(Other definitions for catgut that I've seen before include "Natural material for violin strings" , "Strong cord for stitches, etc" , "Material used for violin strings, for example" , "stringy material" , "Tough string for stitches and musical instruments" .)

I've seen this clue in the Sydney Morning Herald.
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