Possible Clues:

• Insurance-selling lizard
• Lizard type
• Lizard noted for ability to climb smooth surfaces
• Very well caught, say, having come back for lizard
• Cold-blooded type to travel round City to finish off bank
• Thick-bodied lizard
• Lizard seen in insurance ads
• Insurance company symbol
• Harmless lizard
• Creature certainly caught, for instance, climbing