New take on music: bit of opera follows version, one in fashion (9)
I believe the answer is:
variation
'new take on music' is the definition.
I can't tell whether this defines the answer.
'bit of opera follows version one in fashion' is the wordplay.
'bit of opera' becomes 'aria' ('aria' is part of 'opera').
'follows' is a charade indicator (letters next to each other).
'version' becomes 'v' (vt, vi etc).
'one in fashion' becomes 'tion' (I can't explain this - if you can you should give a lot more credence to this answer).
'aria' after 'v' is 'varia'.
'varia'+'tion'='VARIATION'
Can you help me to learn more?
(Other definitions for variation that I've seen before include "Departure from the norm" , "Discrepancy" , "Change, difference" , "Slight difference" , "Slight change" .)