the mk1 phase 3 clio used 13cm components,
in this range there are thousands of options available, my best advice would be go to your local ICE dealer with various part numbers and ask if you can have a listen to them
if was to advise you on any components, it would have to be the Genesis A13.01, i installed these into my saxo and they sounded awesome, i even have the genesis A16.01 sitting in my garage waiting to be installed into my doors, thats how highly i rate them
you could also contact both liquid ice, and evil ice who are both regular users of this forum, they both offer very good discounts on various kit
as for a sub, i have an 8.5LF Boston Acoustics, mainly because i listen to every possible genre of music with the exception of Garage/Rap and RnB, you may want to use a 10" or a 12" sub going by what music you listen to, IMO 15" is too much for a car the size of a clio
you will obviously need an amp (or 2) to run the system, for the components you will want a small stereo amp and depending on the sub, a mono-block amp or a d-class amp will be sufficient
unless you are going for supreme sound quality and constantly fiddling about with all the settings, an EQ would be a waste of money
on the topic of stereo amp - i have a genesis profile 2 amp for sale at £120, retails at £200 and still has 10months warranty on it (unopened - was part of a major plan i had, which went tits up), i have one of these in my system at the moment running the front comps and can safely say that it was the best £20 i have spent on my car