His uncle and potential patron died, and he entered a solicitor's office; but moved on to learn business under the merchant Malachy Postlethwayt.
During a stay in Rome in 1774 he obtained admission to the Accademia degli Arcadi by a eulogy on Maria Maddelana Fernandez Corilla, poet-laureate of Italy.
[2] A correspondent in the Evangelical Magazine mentioned that Seally had been chaplain to the Earl of Kintore, was buried in Ellisfield, Hampshire, and was aged 49 on his death.
[3] Seally published novels, poems, and school books, including:[2] He contributed occasional verses to magazines, and launched a short-lived political paper signed Britannicus.
After separation from Mrs. Lewis he married Mary, eldest daughter of Joseph Humphreys, rector of Ellisfield, Hampshire, and of North Stoke, Somerset, who survived him.