Possible Clues:

• Band member
• Composer - instrumentalist
• 37-Across, e.g.
• Composer, performer of vocal or instrumental sounds
• Minus CIA, one can compose or play
• Gets to fiddle worker over initial underwriting (sic) at institute
• Noted player, as such, entertained by Greek character and Scotsman?
• Cumin is a seedy type found in a pit
• Instrumental performer
• Manic, running wild touring America, one who's in a band?