Being superstitious, a muleteer has one (6)
I believe the answer is:
amulet
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for amulet that I've seen before include "lucky defender" , "Charm warding off evil" , "Charm protecting against evil" , "Thing worn as charm against evil" , "that's charming" .)