Violin part, of noteworthy value (5)

I believe the answer is:

strad

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'violin' is the definition.
(Stradivari abbreviation)

I cannot understand how the rest of the clue works.

(Other definitions for strad that I've seen before include "Top-quality violin (abbr.)" , "Valuable old violin" , "Noted violin" , "Old, very expensive violin (abbr)" , "musical instrument" .)

I've seen this clue in the Evening Standard.

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