Possible Clues:

• Be a carper
• Nitpick incessantly
• Quibble about Smith's pointless block
• Bitch and moan
• Use false arguments
• Carp, the sixth to be found in shrunken state
• Vacillate terribly to start with and complain
• Object unnecessarily left beneath gap, a third hidden
• Find fault with unnecessarily
• Make unnecessary objections