Work has gone into hit for maestro (6)
I believe the answer is:
chopin
'hit for maestro' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'work has gone into' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'has' says to put letters next to each other.
'gone' becomes 'ch' (I can't explain this - if you can you should give a lot more credence to this answer).
'into' becomes 'in'.
'op' put after 'ch' is 'chop'.
'chop'+'in'='CHOPIN'
Can you help me to learn more?
(Other definitions for chopin that I've seen before include "Polish composer and pianist, d. 1849" , "No chip on this composer's shoulder" , "Romantic figure" , "Writer of music" , "Frederic . . . . . ., great 19th century Polish composer" .)