Possible Clues:

• Baseball player reverses cap
• Players in defence getting best extra support
• Sponsors leading baseball catcher
• Supports crown as a last resort?
• Position that applies to across clue after 90-degree rotation?
• Endorses best baseball player
• Catcher shows support for Crown
• Defenders close to Best getting extra support as a last resort
• A system or plan used if no other arrangement can be made
• Supports best insurance policy