Possible Clues:

• Oops - criminal in papers is a little crawler
• Small crustacean
• One stupid person at party turned up as a crustacean
• Lousy type in party place, half cut, rolling over
• Pill bug or gribble
• Shuffle, say, round well to find creeper
• Crustacean such as a woodlouse
• Woodlouse, for example, is round with shell
• Flattened crustacean
• Crustacean, one's round shell