Way of teaching an arrangement of Chopin’s (7)
I believe the answer is:
phonics
'way of teaching' is the definition.
(way of teaching people to read)
'an arrangement of chopin's' is the wordplay.
'an arrangement of' indicates anagramming the letters.
'chopins' is an anagram of 'PHONICS'.
(Other definitions for phonics that I've seen before include "Method of teaching people to read" , "Catch one's breath" , "Reading teaching method" .)