I've just had another look at this, and I think it might be possible to pin it down fairly precisely. This is the list of places in Waddon that I found before:
Code:
http://placenames.org.uk/browse/mads/epns-deep-86-c-mappedname-000253
If you go up a level to Portisham using the breadcrumbs links at the top, you'll find a long list of localities within the parish, and there are so many of them that they must refer to very specific areas. Waddon/Little Waddon is one of these.
The Waddon/Little Waddon page gives all the names that have been found referring to that small area, and the bottom one and the one two above it may be significant. They are both taken from the same source (J. Hutchins,
The History and Antiquities of the County of Dorset (3rd edition), 1863), so it's reasonable to assume that they refer to different but related places.
The bottom one is
East Waddon, Little Waddon, or Gerard's Waddon and the other is
West Waddon, vulgo Pitcher's Waddon (vulgo is Latin for commonly).
East Waddon can be seen on this map:
Code:
http://maps.nls.uk/view/101447210
West Waddon isn't marked, but as there doesn't appear to be any other settlement between there and Portisham, I strongly suspect it's what is shown as simply Waddon. So based on Hutchins, that seems to be Pitcher's Waddon.