Related Clues:

• Get to the bottom of things?
• Really get into
• Jab
• Use a mattock
• With 52-Across, what treasure hunters do
• Prepare for planting
• Do some research
• Sarcastic comment
• Be into
• Unkind remark
• "Understand?"
• "Comprende?"
• Search deeply
• Excavation
• Archaeological trip