Crossword Genius

Though notedly valuable, not the complete instrument (5)

Ross

I believe the answer is:

strad

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'instrument' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for strad that I've seen before include "fiddle exposed" , "Famous violin" , "Noted violin" , "Valuable violin (colloq.)" , "musical instrument" .)

I've seen this clue in the Evening Standard.
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