Possible Clues:

• Pale old Caledonian gathers energy from moving about
• The type of post you'd need if you're planning to go to 25 across
• Wooden fence stake
• Striking protesters
• Kind of fence that's assembled to keep workers out
• Strike line; stake
• Sentry
• Type of fence that works lovely around country cottage, doesn't work at all around factory
• Wooden stake for a fence
• Select film for outpost