Related Clues:

• Oxygen producer
• Kibbutz, for one
• Olive or apple
• Christmas centrepiece
• Orange or oak
• What dendro- means
• Fruit bearer
• Place for a house
• Yuletide buy
• Oak, e.g.
• Elm, for one
• Abode with multiple layers?
• Back into a corner
• Restrain, with 'up'
• Possessor of many rings