Study of Chopin, perhaps (5)

I believe the answer is:

etude

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

I don't understand the remainder of the clue.

(Other definitions for etude that I've seen before include "Chopin study" , "Short piece of music for solo instrument" , "short musical piece" , "Testing musical composition" , "Indian statesman" .)

I've seen this clue in the Evening Standard.

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