21 across - Mock prosperous person that’s locked in East Georgian jail (4,2,3,5).
The answer is “send up the river” but how does Georgian” come into it?
I get “send up” for mock, TH(E)RIVER from prosperous person that’s locked in East, and jail looks like the definition.
However this doesn’t account for Goergian. I understand that the phrase originated from sending people to Sing-Sing which was in the Georgian era, but that feels like way too much of a stretch. What am I missing?