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I could be wrong but I think there is only one reverse light on the car.
The other thing to check is the reverse sensor on the gearbox. There will be an electrical sensor plugged in to the gearbox, on previous clios the connector has been green. It's worth putting a multimeter on that and then getting someone to put the car in to reverse. The sensor is cheap but you may lose gearbox oil when changing it.
Clios only have one reverse light it is on the passenger side doh.
In Australia nearly all cars have two reverse lights plus someone stopped wound their window down and said my passenger side reverse light was out, which actually got me motivated to post. However a call to Renault dealer confirmed one side only.