Fighter is harmful when ignoring the odds: right then left from boxer (7)

I believe the answer is:

samurai

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'fighter' is the definition.
(samurai is a type of warrior or fighter)

I can't explain the remainder of the clue.

(Other definitions for samurai that I've seen before include "Japanese militarist" , "Seven -, film directed by Kurosawa" , "Sudoku variant" , "Member of military class" , "Traditional Japanese warrior" .)

I've seen this clue in The Guardian.

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