Related Clues:

• Bound to happen
• Word often said with a shrug
• Beyond question
• "No prob!"
• Steady-handed
• 'I'd be glad to!'
• Free of doubt
• ___ as shootin'
• "Why not!"
• 'OK by me'
• Certain about ruse
• Confident sort of ruse
• Certain to be a ruse
• Certain, confident
• You'd be certain to find a ton of this under a 27 across.