A violin feature that covers privates? (1-6)

I believe the answer is:

g-string

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'a violin' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for g-string that I've seen before include "Skimpy garment" , "Air on a - -" , "Stripper's minimal garment" , "Violin catgut - stripper's garment" , "Minimal wear" .)

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

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