I don't know on the clio mate. I've not had it apart yet. On most cars they're in the tank - sometimes in the same housing as the pump.
I've noticed there is an inspection cover under the back seat with the wires going in so may be worth checking here incase the wires have rubbed or chaffed with the weight of the seat (and anything on it)?
If not its worth checking the sender but I don't know the procedure for that on a clio.
At worst I'd get a known good sender and swap it as it shouldn't be too bad a job.
no wires rubed not sure how to get the cap off under the seat... it must be the senser under the tank surley