Setter fetter (5)
I believe the answer is:
leash
'setter fetter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for leash that I've seen before include "Spanish city famous for swordmaking" , "Strap for holding a dog while walking" , "Line for holding dog" , "Restraining strap for dog" , "Rope used to restrain an animal" .)