Related Clues:

• Subject of an S.E.C. inquiry
• Breakwater
• Facial feature, for some
• Morning ringer
• Fire sign?
• Panic
• Treacherous spy
• Tap trouble
• Security feature
• Underground tunneler
• Suburban tunneler
• Reason to call a plumber
• Plumber's target
• Eye opener, in a way
• Watergate problem