Crossword Genius

Owner of sword I plant while not going down (7)

Ross

I believe the answer is:

samurai

I'm a little stuck... Click here to teach me more about this clue!

'owner' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for samurai that I've seen before include "Traditional Japanese warrior" , "Sudoku variant" , "Member of military class" , "Historical Japanese warrior" , "Japanese militarist" .)

I've seen this clue in The Guardian.
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