I believe its recommended to keep the engine under 3500 revs for the first 1000Kms (not sure what it is in miles) at least. Check the manual, it will have the Renault recommended limit and duration.
Basically just drive it carefullly for a while to let the engine wear in before you thrash it. You should also vary the speeds and revs you drive at (ie dont cruise on the freeway - change your speed every couple of minutes). Its for this reason that some manufacturers only enable the cruise control funtion at the first service, after the cars broken in.
It is very hard to drive these clios gently, they just want to take off! But 1000Ks comes soon enough, and then you can floor it. Youre going to own the car for a long while, and youll have plenty of oppertunities to rag it later, so treat it well to start with and itll serve you well later on.
David