Swindling musician (7)
I believe the answer is:
fiddler
'musician' is the definition.
(fiddler can informally mean a violinist)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for fiddler that I've seen before include "Violinist - cheat" , "Violinist - swindler - type of crab" , "Violinist (colloq.)" , "String player" , "Violinist (on the 11?)" .)