Related Clues:

• Free of doubt
• Unofficial Seabees' motto
• ___ as shootin'
• "Why not!"
• "OK"
• Positive, as an attitude
• '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.
• One may be certain to need a ton of it to get into church
• A ton of this is certainly cut out for the church
• 20 down comes to a certain end like this, and that's the end of it