Related Clues:

• Keep secret
• Archaeological operation
• Wait to be found, in a game
• Work in a mine
• Critical remark
• Path for a mole
• Go at it with spades
• 'Skylarking' band
• Cow cover
• Bit of sarcasm
• Make a hole
• Enroll in a witness protection program, say
• Go into seclusion
• Tannery skin
• Understand, in hippie lingo