Possible Clues:

• Papa I caught with mainly pleasant piece of cake
• Outdoor nosh
• Outdoor meal something easy
• The best prison, we hear, will offer outdoor excursion
• Outdo 'Vote for Clegg' on the radio
• Meal eaten on a blanket
• A piece of cake for eating outdoors
• Almost all choose not to finish agreeable outdoor meal
• Fieldfare?
• Meal in a meadow, maybe