Possible Clues:

• Does it make for lower profits?
• Big moneymaker
• Project generating a safe steady return
• Accountant from college taken in by presentation that's a money-spinner for those dealing in stock presumably
• Realise Daisy is a source of easy money
• Source of easy money
• Business making large profits
• Money-spinner? Caught a cold when invested in gig
• Reliable profit center
• Lucrative endeavour