Yes, it is. It's a family of engines used for a very long time on little renault (and not only...) cars.
You can find it on wikipedia, Cleon-Fonte. I still can't post link
But in 90s it begun to be replaced by the Energy (the "E" family) and by the "D" family.
So only the first Mk1 Clio and Mk1 Twingo had a Cleon engine.