Related Clues:

• Screws up
• Doesn't call a spade a spade?
• Misses the mark
• Sins
• Stumbles
• Thwarts
• Does the wrong thing
• Is guilty of a 28-Across
• Flubs
• Makes a boo-boo
• Bumbles
• Goes off
• Foozles
• Undercharges, e.g.
• Transgresses