Crossword Genius

Mark an old-fashioned couple? (5)

Ross

I believe the answer is:

twain

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This clue might be a double definition.

'mark' is the first definition.
(Mark Twain)

'an old-fashioned couple?' is the second definition.
'twain' can be an answer for 'couple?' (archaic term for 'two'). I am not certain of the 'an old-fashioned' bit.

Can you help me to learn more?

(Other definitions for twain that I've seen before include "Mark, US writer" , "Archaic term for two" , "Old couple" , "I want (anag) - US novelist and humorist" , "Two of the same kind, archaically" .)

I've seen this clue in the Sydney Morning Herald.
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