Related Clues:

• One working hard to overcome drug, seeing trap
• Something introduced to defeat from within
• Investment aid produced by hard worker and major consumer
• Present ploy that finally yielded dividends in long-term investment
• Malicious program
• One hard-working hack maybe providing hacker's work?
• Subversive means of attack
• The Enemy Within: John, a vagrant, enters resort for bombing
• Computer problem that brought an end to investment
• One works hard confronting equine virus
• Hector, perhaps, and mount threat to computer
• Malevolent infiltrator
• Historic ''gift'' delivered to ancient Turkey
• Agent that undermines from within
• Destructive software