They come in two pieces, the back section is normally the one which gets damaged/cracked.
They are around £70-£90 IIRC. Not cheap!
Best bet is to locate a Clio for breaking on eBay or local scrap yard, I regularly called RenParts (http://renparts.co.uk/) and eventually I managed to get hold of a replacement for around £25 inc postage - just got to be patient.