Hi, I had this, turns out ball joint was hanging out.
£190 part, but there are 2 pieces @ £190, find a mechanic who can pin drill rusty Allen keys bolts to separate the 2 parts and save you £190
See this thread,
http://www.clio197.net/forum/showthread.php?t=9362
This would be my first thing to look at, take your wheel off from the side your hearing the noise, grab your disc and wiggle, if it moves out of reason, here's your problem
Will
My noise was mainly when dry turning, after a few weeks, you could hear under heavy breaking, also note if it was really wet the noise occasionally stopped..... Strange I know...