### Clue: Maybe foils Nazis, keeping promise (6)
### Answer: SWORDS 
 ### Explanation: Definition: Maybe foils
 SS(abbrev. for the Schutzstaffel, a paramilitary organisation of the Nazis) **containing**(keeping) WORD(promise, as in "you have my word that I'll do it").
Defn: Examples of which/maybe are foils, used in the sport of fencing.