Possible Clues:

• Do we live with the beetle?
• Beetle, a grain pest
• Crop-destroying beetle
• There's so little grub on the six-fifty
• You and I are backward? That takes the (ship's) biscuit!
• The Queen declares herself nefarious and a crawler
• Just a little grubby with the six-fifty
• Tiny, almost loathsome maggot
• With grub in grub we get no good with it
• Beetle