Possible Clues:

• Even-temperedness, e.g.
• Beneficial thing to remove lead from hound
• Anything beneficial
• Plus, so to speak
• Balance-sheet ''plus''
• Honesty, resilience or a sense of humor, perhaps
• A Ferrari or yacht, in accounting
• A Hardy girl rejected thing of value
• Intel source, in spy novels
• Pitcher's pinpoint control, say