Crossword Genius

Motion formerly carried by marrying Scott and Janis? (6)

Ross

I believe the answer is:

joplin

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'scott and janis?' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for joplin that I've seen before include "Scott -, US ragtime composer" , "Scott -; Janis -" , "pianist" , "rock singer" .)

I've seen this clue in The Telegraph.
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