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Accordionists, not content, disapprove over E sharp (6)

Ross

I believe the answer is:

astute

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'sharp' is the definition.
(synonyms)

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

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(Other definitions for astute that I've seen before include "Peerceptive" , "Able to make accurate assessments" , "'Perceptive, shrewd (6)'" , "Shrewd, wily" , "Wide" .)

I've seen this clue in The Guardian.
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