Piano users reviewed book (10)
I believe the answer is:
persuasion
'book' is the definition.
(novel by Jane Austen)
'piano users reviewed' is the wordplay.
'reviewed' is an anagram indicator (letters reviewed or revised).
'piano'+'users'='pianousers'
'pianousers' is an anagram of 'PERSUASION'.
(Other definitions for persuasion that I've seen before include "Belief" , "work of Jane Austen" , "kind of inducement" , "Piano users (anag) -- novel by 14" , "Jane Austen novel" .)