This looks like Nuctenea umbratica (walnut orb weaver), it may have lost a leg or two, but they often do adopt a pose that makes it seem like they have 6, not 8 legs.
They tend to hide away in cracks during the day, building webs at night, so not often seen but fairly common.
Another Nuctenea umbratica.
Here is the link to another spider ID query with the same species -
(I can see four legs on the right side, and two parts to the body))