Possible Clues:

• Supportive framework required, test on horse backfiring
• Large framework horse hauled up with effort
• Support structure
• Derrick's supporter mounting horse, on the go!
• Cape Canaveral sight
• Overhead structure for a crane or railroad signals
• Good attempt to incorporate a new framework
• Good worker on railway platform
• Overhead structure supporting equipment
• Books Lineker, say, without support