Related Clues:

• Trial mate
• Miss a cue, say
• Baseball boo-boo
• Do the wrong thing
• Drop an easy one
• Get one's wires crossed
• Delude oneself
• Cause for a correction
• Make a mess of things
• Misplay
• Be imperfect
• Trial partner
• It could be clerical
• It needs correction
• Flubbed it