He engaged in mercantile pursuits and in banking and shipping, and was one of the founders of and served with the First Troop Philadelphia City Cavalry during the American Revolutionary War. In 1780, he subscribed a large sum of money to help the American forces and aided the Continental Congress with money and credit.
In 1781, his daughter, Deborah, married Colonel Walter Stewart, later Inspector General of the Continental Army and then Major General of the Pennsylvania Militia.
He died in Philadelphia; interment was in a vault in St. Paul's Cemetery.
- United States Congress. "Blair McClenachan (id: M000336)". Biographical Directory of the United States Congress. Retrieved on 2009-03-08
- The Political Graveyard