Although his son, Tanetsugu, had been born in the same year (in 737) as the death of his father, Umakai, who served as Sangi (councilor) and Shikibukyo (Minister of the Ministry of Ceremonial), it is mysterious that there is no record of Kiyonari's careers except the record of 'no special rank or title'.
参議兼式部卿であった父・宇合の死去と同じ年（737年）に息子・種継が誕生しているにも関らず、「無位無官」と伝わっている他には清成個人の活躍の記録が全くないのは不可解である。