Hi HT
As far as I know, there isn't a straight forward clearing system, as it's not like when you use ucas for an undergraduate degree. However, I applied late to do a masters (like 4 weeks ago) and got an offer. Your best bet is to phone up some places and see if they have deadlines, or if they have any places avalible.
As it gets closer to terms starting if courses havn't filled up places they are going to want people to fill them up.
Hope this helps
Delly x