Possible Clues:

• Welsh insect that 13 might detect?
• Lie weight on kangaroo
• Giant in fairy story
• Huge thing — huge porky?
• Lie told by skipper after wicket
• Work by Auden perhaps, a great piece of fiction
• Enormous lie
• Young locust must have put weight on to be a such a big one
• In slang, it's very big - like a lie or fish
• Rump of cow and frog, perhaps, in huge pork pie!