Penname of Author Samuel Langhorne Clemens

This page is the CodyCross answer for the clue below from Treasure Island, Group 1032, Puzzle 2 (Hispaniola).

Question is: Penname of Author Samuel Langhorne Clemens

and the answer is: MARKTWAIN

Word Meaning:

MARK — (heading) Boundary, land within a boundary.

Definitions from Wiktionary.