Possible Clues:

• See 2
• Lunchbox item
• Picnic food
• Perhaps, a submarine course
• Snack with traditional jam providers brought into school
• ... but leaving one out of picnic is not so bright
• Found on the beach by women's organisations before church lunch with something in between?
• Old advertiser's royal links, a lot cut short
• Lunchtime snack, possibly — and port
• Lunchbox item, usually