TWAIN

Pen name of Samuel Langhorne Clemens, d. 1910) (5)

Solution has appeared in 3 crosswords (2 across and 1 down):

• Quick crossword No 16,551 — 2023-05-23 23:00:50
  20A: Two (5)
• Quick crossword No 16,379 — 2022-11-04 00:00:28
  20A: Two of a kind (like Mark?) (5)
• Quick crossword No 15,324 — 2019-06-18 23:00:09
  19D: Pen name of Samuel Langhorne Clemens, d. 1910) (5)