Possible Clues:

• Japanese fighter
• Samuel, that's how you see, by the sound of it, for the knight in Japan
• Japanese military retainer
• My boy, your eye sounds so Japanese (7)
• US army nearly stunned first-rate swordsman
• Literally, ''servant''
• Jap. warrior caste
• Drink with arsenic knocked back by very fit warriors
• Follower of the Bushido code
• Fighters of film cover wall-painting with canvas, both short of length