Possible Clues:

• One prefers squash to snakebite?
• South American creature
• Montana mining town
• A don can change - and a crawler
• S. Am. constrictor snake
• In the water a tin is upset on Father - so contricting!
• This will make you feel the squeeze if you put a hundred on Father at last.
• Water-boa
• A slippery customer, prisoner's hiding in country, not caught
• Zoo feature