Possible Clues:

• Good dinner — something from pig, perhaps — including live music at the start
• Good feed making Spooner's horse kick up a fuss
• Not food for those at the Round Table?
• Not, say, spaghetti hoops on a round of toast?
• Satisfying supper, for example
• Reconcile this writer with a large, satisfying feast
• One of three in a day, perhaps
• Nourishing repast, of which 17-, 26- or 44-Across might be a literal component
• Talk about member preserving energy -- that's healthy and satisfying
• Nutritiously balanced plateful ... or what 17-, 24-, 40- and 51-Across may constitute?