1) Ancient Chinese state 2) Obsolete unit of measurement 3) Thames tributary 4) Unit of mass 5) Weight unit in England Found on https://www.crosswordclues.com/clue/wey
[unit] A wey is a unit of mass used in England since before 900 CE. The value of a wey has varied over time though was originally used to denote 2 hundredweight or 256 pounds. It has also been used as a unit of volume for dry commodities, denoting roughly 40 bushels. The word is derived from the Old English wæge, meaning weight. ... Found on http://en.wikipedia.org/wiki/Wey_(unit)
Ancient Measurement Terms: Weight or volume. See: Cart-load. About 19½ hundredweight, dependent upon material. Also, 320 gallons, or 40 bushels, or 30 fotmal.
Found on http://www.hemyockcastle.co.uk/measure.htm