It's an exciting read for pianist's assistant (4-6)

I believe the answer is:

page-turner

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'pianist's assistant' is the definition.
(I've seen this before)

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

(Other definitions for page-turner that I've seen before include "Gripping book" , "'Unputdownable' book" , "Book one can't put down" , "exciting book" .)

I've seen this clue in The Irish Times.

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