Foil employer who erects barriers? (6)
I believe the answer is:
fencer
'who erects barriers?' is the definition.
(someone who puts up fences)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for fencer that I've seen before include "A sword sportsman" , "Sword fighter" , "One with flashing blade" , "armed man" , "User of foil in sport" .)