Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Cluvius, a, the name of a Roman gens, Cic. Rosc. Com. 14, 42; id. Fam. 13, 56, 1 sq.
Hence, Cluviāna hereditas, of a Cluvius, Cic. Att. 13, 46, 3.