Ok, easy. All names of trees.
1. Not the youngest tree around
2. Someone crazy about bricks and mortar?
3. A description of Shylock as a young boy?
4. There's always two of these trees by the sound of it
5. Not so much a tree - sounds like an island
6. Would you find this tree close to the ocean
7. Give Margaret a "Glasgow kiss"
8. There's nothing fancy about this tree
9. If you're up one of these, you're in lumber!
10. Morecambe, San Francisco and Bengal have this tree in common