Related Clues:

• Good to go
• Champing at the bit
• Word before 'set, go!'
• Part of a willing trio
• Disposed
• On guard
• Mistrustful
• Geared up
• Prepared for action
• In position
• Poised for action
• Done cooking
• Openly distrustful
• First word of a three-word command
• 'Set?'