Possible Clues:

• Possibly a Sûreté stiff?
• Far from comfortable
• Gold trees swaying on plain
• Strictly speaking, there's a tree around us
• Are set to form a union in: it's simple
• Grim woman who wrote endlessly about monarch
• Hard stone in gold before
• Strictly speaking, that's us in a broken tree
• Severe, ascetic
• That's us in a tree, strictly speaking (7)