Related Clues:

• Side adventure
• Do something wrong
• Commit 18-Down
• Wander off course, e.g.
• Flub it
• Betray fallibility
• Bungle the job
• Flub the shot, say
• Cause an unearned run
• Guess wrong
• Say the wrong thing
• Transpose digits, say
• Overcharge, e.g.
• Casual affair
• 'To ... is human'