Possible Clues:

• This preserves island, nurturing love thus
• Houston regularly invested in island's oil
• A wood preservative Rose applied in shelter
• Protector of wood that's vast and old in part of Greece
• Dark oily liquid, preservative for wood
• Preserve deal, say, in order to score point
• Oil beginning to exude under wrecked scooter
• Wood treatment
• Wood preservative's treated core, so termite's gutted
• Oily liquid for preserving timber