At/in a canter
Definition 1 of 2
Pro Tip 1/3Effortless Success
Used when something is achieved with such ease it looks like no hard work was needed. 
He secured the job in a canter, impressing everyone with his skills.
Pro Tip 2/3Casual Victory
Suggests winning was done nonchalantly, without worry or stress. 
She passed the test in a canter, without even studying much.
Pro Tip 3/3Understated Achievement
Highlights a task completed with simplicity, making it seem unremarkable. 
He tackled the challenge in a canter, making it look ordinary.