Related Clues:

• Be human, so they say
• Go awry
• Muff an easy one
• Make a boner
• Do wrong
• Imperfect verb?
• Miss a cue, say
• Do the wrong thing
• Drop an easy one
• Get one's wires crossed
• Delude oneself
• Make a mess of things
• Misplay
• Be imperfect
• Fail to attend