Possible Clues:

• Characters that can be incomprehensibly in the soup
• Gamble on first-class mark in exam for these characters
• A-ha's unreleased album 'Live At Trondheim' -- opening for ABC
• Whole set of letters
• All the characters giving man on radio aid
• Mountain height, a risk for several characters
• It breaks the 'I before E' rule
• Fundamental language components
• Might little Alfred make a sound wager by letter?
• Group of characters in sacred river needing help