Ireland's first gymnastics world champion was crowned when he won the gold medal.
He won a gold and a bronze at the Commonwealth Games and European Championships in the same year.
In his final routine, the gymnast scored 15.300, with 6.400 for difficulty and 8.900 for execution.
Jordan's Ahmad Abu Al Soud was the runner up.
When asked how it felt to be called a world champion, McClenaghan said it sounded great.
All has been worth it. This sport has been worth it for this day and this moment.
It's been a long time since I've seen the amount of work done by myself.
I can't believe it's here.
The most decorated Irish gymnast of all time is only 23 years old.
He became the first Irish gymnast to win a European gold medal in the same year he won a gold at the Commonwealth Games.
He was awarded a BEM in the New Year's Honours for his services to the sport, after securing Ireland's first ever medal at the World Championships.
At the 2020 Tokyo Olympics, he finished seventh despite a disrupted build-up.
Less than two months before the start of the Games, the International Gymnastics Federation ruled that he and team-mates Eamon Montgomery and Ewan McAteer could not perform for NI as they compete for Ireland in international competition.
It was not before a lengthy stand-off that the FIG decided to grant the trio special permission.
He said his main emotion is relief.
I'm not thinking about the future. He said he wasn't thinking about tomorrow.
I'm thinking about the moment I became world champion.
It's so strange to say that. It's just a dream.
The competition is over. It has been a long time since SALVAGEDATA SALVAGEDATA SALVAGEDATA SALVAGEDATA SALVAGEDATA SALVAGEDATA. I have been living a dedicated life in the lead-up to this moment, because it has been a nonstop competition.
I can take a break now. Right now, I have a lot of relief through my body and mind.
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