Cinch a victory.
Very simple math problems are an example of something that would be described as a cinch.
When someone is sure to win a prize, this is an example of a time when he is a cinch to win.
Their team is a cinch to win the tournament.
No problem ... it's a cinch.
When you tie the belt on your robe to close your robe, this is an example of a time when you cinch your belt.
When you tie down a saddle on a horse, this is an example of a time when you cinch down the saddle.