Related Clues:

• Fi front
• You can get a deg. in it
• Hari or Harriet
• Forensics, for ex.
• Lab goings-on (Abbr.)
• KGB worker
• Enemy agent
• Keep watch secretly, maybe for foreign government
• One who collects secret information as for government
• Person who secretly collects information as for government
• Secret agent of government
• Watch covertly like secret agent
• One gathers information on enemies
• One gathers information surreptitiously
• The W.I. would not get fat with such a hidden enemy