Possible Clues:

• A double rum is put out for a Japanese fighter
• Warriors putting spirit back into Asia, perhaps
• Japanese military retainer
• US army nearly stunned first-rate swordsman
• Trad. Japanese warrior caste
• I get a drink when back to fighting Japanese
• Literally, ''servant''
• Acting with spirit, amateur is about to give back retainer
• It sounds as if your eye, Samuel, is on Japan
• Drink with arsenic knocked back by very fit warriors