Related Clues:

• Archaeological site
• One way to get underground
• Probe
• Friendly poke
• Understand, slangily
• Boxer's weapon
• The 'one' of a one-two
• Archaeological excavation
• Start of a one-two punch
• Quick hit
• Get to the bottom of things?
• Really get into
• Jab
• Use a mattock
• With 52-Across, what treasure hunters do