Renault will say they will have a look and see if its been abused or if its down to a fault.
They will be able to tell if its been abused by blue areas which denotes that it has got extremely hot. They can only do this by stripping it out and checking by which time youll be paying all the labour charges if its not a fault.
You dont have to ride a clutch for it to wear prematurely, it can happen by accelerating hard all the time, and snatching gear changes.
It could be oil on the clutch plate or something like that. Or something unrelated like a sensor?
Best bet is , as suggested above, put it in 5th at 30mph and depress the throttle fully, see if the revs rise out of sync with the change in speed. This puts your clutch under a lot of pressure and will definately tell you if its slipping or not.
My clutch went at approx 16K on my Cup, I moaned like hell at my dealer when they said it was abuse......I went on about how Renault must have used crap materials etc....and they eventually put it through on warranty...which was a good thing as they wanted £500 to replace it!!!!!!!!!!
( I did nail the hell out of it and it was my fault) (never once smelt clutch though.)