Possible Clues:

• Tree, not entirely popular choice
• Tree by start of left-hand bend
• Longbow's structure made of wood
• The tree gets built over at the bottom
• Tree line's a curved form
• After half a century it is built around over the tree
• Tamarack tree
• After half a century the tree gets over the top
• Tree with durable wood
• Charles struggling, 'e's leaving tree