Related Clues:

• Like a sure bet
• Safe
• Fail-safe
• Without a downside
• Can't-miss
• Perfectly safe, as an investment
• Like some investments
• Surefire, as an investment
• Safe, as an investment
• Like certain investments
• Sure to work
• Putting zip on the line
• Completely safe
• Money-back, maybe
• Lacking a downside