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.

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