Related Clues:

• The source of old rubbish found outside?
• Rhizome
• Underground feature sometimes square
• Old Bob with no work will go about sneakingly
• Elihu --, winner of the 1912 Nobel Peace Prize
• Mind someone else's business?
• The way we hear Genesis
• Grub a factor in foundation
• Rummage (through)
• Dig for truffles
• Sleeping place that lacks sun -- it's underground
• Repeated word in "Take Me Out to the Ball Game"
• Proverbial purse
• Organic anchor
• Probe, with ''into''