Possible Clues:

• Low-fat main course, half-finished, completing Greek character's sustenance
• Frost in fruits destroying one universal sustenance
• Enthusiast about to reduce measure of food
• Three people tucking into fruit for sustenance
• Met in turn to make food
• Nourishing food
• Food fanatic keeping fit, even empty
• Head, accepting haircut, went inside for food
• Food — fruit and ice — with wrapping from 13
• Eats noodle to keep slim, even if empty