Possible Clues:

• Spruce (up)
• Spruce up
• Small pine for one, or spruce
• Become bright, tidy and more efficient
• Spruce the small arboreal animal is beside
• Wise (up)
• Brighten (up)
• About to damage nest built in spruce
• First sign of sun and furry animal will get to brighten up
• Improve appearance of gun over a few weeks