Possible Clues:

• Perhaps a boxer may erupt
• Cavity formed by explosion
• Hole of volcano or bomb
• One might perhaps get you a box or get you a hole on top
• Queen wears outfit in depression
• Feature visible on the moon
• There''s a hole in the top for a boxer, perhaps
• That's hole in the top of the tracer
• Might the whole sound of one's work be boxing, perhaps?
• Old car runs into gaping hole