Possible Clues:

• Person who causes damage for political reasons
• One engaged in malicious disruption
• Abort use possibly? One might well do that
• Our beats (anag) — fifth columnist
• Hitchcock classic
• Sure boat at sea is a destroyer
• Someone who deliberately damages someone else�s property
• Destroyer's ruse at sea to protect stricken boat
• Wrecker misled boat user
• Our beast on the rampage, a wrecker