Maestro cut in (6)
I believe the answer is:
chopin
'maestro' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'cut in' is the wordplay.
'cut' becomes 'chop' (chop is a kind of cut).
'chop'+'in'='CHOPIN'
Can you help me to learn more?
(Other definitions for chopin that I've seen before include "Frederic . . . . . ., great 19th century Polish composer" , "popular composer" , "No chip on this composer's shoulder" , "Polish virtuoso composer" , "Double centenarian" .)