Novels of Mark ____ include Pudd'nhead Wilson (5)

I believe the answer is:

twain

(Other definitions for twain that I've seen before include "Mark -, Huckleberry Finn author" , "Kipling denied ever meeting" , "Tom Sawyer author, d. 1910" , "Two (arch.)" , "Mark ___ , American writer" .)

I've seen this clue in The Times.

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