Possible Clues:

• Evidence of duel? I'm the thing involved, perhaps
• Curved weapon — I'm covering it in something left after battle
• Sword wound — I’m seen with it being nursed
• Sword: I’m the very thing to cut lasting mark
• Something that cuts racism -- it's out of order
• Single-edged sword with a convex curved blade
• Mark admits one American university offers cutting edge stuff
• Sword: it stops awful racism
• Barman takes iodine on motorway to sailor with sword
• Blade -- I am just the thing to open old wound