Possible Clues:

• Jam them for keeps
• Penny's absorbing book: 'Seasons'
• Jams for keeps
• Keeps the Territorial Army on top of problem
• Places for wildlife
• Keeps in unaltered condition
• Keeps alive, e.g.
• Keeps quiet in front of the substitutes
• Keeps in unchanged condition, or from decay
• Keeps, jams