Weightless swords fashioned from metallic waste (5)
I believe the answer is:
dross
'metallic waste' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for dross that I've seen before include "Scum on molten metal" , "Waste from molten metal" , "Waste coal - rubbish" , "Rubbish; impurities" , "Refuse - dregs" .)