A lot of money for a bit of music (7)
I believe the answer is:
fortune
'a lot of money' is the definition.
(I've seen this before)
'for a bit of music' is the wordplay.
'a bit of music' becomes 'tune' (I've seen this in another clue).
'for'+'tune'='FORTUNE'
(Other definitions for fortune that I've seen before include "A lot of money - luck" , "'Chance, luck (7)'" , "Providence" , "Fate, destiny" , "Big bucks - fate" .)