Mark -, US author of 1881 novel The Prince and the Pauper (5)

I believe the answer is:

twain

(Other definitions for twain that I've seen before include "brace" , "Mark, US writer" , "Old pair beginning" , "Pen name of Samuel Langhorne Clemens, d. 1910)" , "Mark -, Huckleberry Finn author" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.