Reply To: Drop cap inside a box

I'm no expert, but my thought is to create a paragraph style that includes a drop cap with a particular character style. When defining the character style, under “character color” make it paper (white), then under “underline options” create an orange underline of a large enough weight to make it cover the background. Just adjust the offset so that it's centered properly.

The technique of combining paper-colored text with an underline so huge it becomes the background color is something I learned from Nigel French's InDesign courses at lynda.com.