Possible Clues:

• Sounds like whiskey, for example, is good for a picnic
• Snack (a 'substantial meal' for Michael Gove?)
• After alcohol, urge to have a snack
• It's not in the shell; it's in the meat
• Picnic food for Delia. Whisky�s mine
• Whisky, say, taken before good savoury item
• Encourage to follow drink with snack
• Oval food, mainly sausage meat
• Stop urge to snack
• It is enclosed in sausage meat