Possible Clues:

• Cancel immediately, we hear
• Bad loan, to an accountant
• Give up on what accountant is likely to do
• Send a letter at once to the auditor
• Whiskey sour arrives finally - service isn't one to remember
• Tax deduction ... or a hint to solving 70-Across?
• Send letter for total
• What authors do on holiday to cancel a debt
• Total wreck, send it away
• Send away for being a complete failure