Possible Clues:

• Venomous lizard of the Southwest (... letters 3-8)
• Log in stream (anag) — venomous lizard
• Lizard with a poisonous bite
• US resident regrets 'no malignancy' is showing up
• *Giant poisonous lizard that's too lazy to pose any real threat to humans
• Venomous lizard
• Bulky lizard from Bamako?
• Large venomous lizard
• US soldier in time set about battle, seeing venomous attacker