If the OP is saying it wasn't doing it before though... surely something must be amiss? - I've never had LED bulbs stay on slightly in any of my cars! Be it external number plate ones or internal lights, which your more likely to notice.
Best way to check is get a multi meter, remove one of the bulbs and see if there is still a slight voltage over the pins in the fitting, if there is I'd suspect maybe a dodgy earth or an earth strap. Not sure where they are on the Clios though there will be a few in the engine bay but it's more likely to be a smaller one on the interior somewhere. Usually they are onto the metal work of the car so foot well sort of area.